Ships & Modules

You're overtanked for highsec space and don't have a propulsion mod, so you might want to give thought to fitting AB/MWD, a target painter and rigor/flare rigs as your slot layout permits. Without that extra speed you'll take a long time to complete some sites, lose most sites others interrupt and the extra speed will help your tank too. You'll be mostly facing frigates, cruisers and battlecruisers anyway, so your practical damage application could use the boost a target painter and the rigs provide and you need that extra boost to get the maximum out of your theoretical DPS.

Oops yes I have a 10 Mn AB II fitted, forgot that from the fit. I've heard quoted figures of over 600 dps from a Tengu - are those base ones as shown on the fiting screen, and not using a TP?

I'll edit my original post now to include the AB.

With heavy missiles that figure sounds like what your theoretical DPS potential would be, if you'd be using scourge wrath missiles agaisnt optimal targets. You're not going to be doing that much actual damage to targets in highsec. The targets are simply too small for you to apply your full damage. It's not much of an actual issue, since you can kill everything so fast anyway. It's just something to keep in mind if you're trying to find ways to improve your efficiency.

I was suggesting a TP and the rigs merely because it will help you kill some of the targets faster and you could easily lighten your tank to do it. That extra buffer will do you no good against the NPCs and might even be a detriment, since it makes you easier to hit and therefore increase the amount of damage you have to repair overall. It's a minor issue at best though, so if the extra buffer makes you feel more comfortable, go ahead and use it. At least it will make you a bit harder to suicide gank, so it's not all bad.

Did you actually read the post? I said I was having powergrid issues fitting the 6th launcher.

Could you please post a suggested fit that includes a 6th launcher?

I made this in pyfa in about 5 minutes so:
[Tengu, High sec exploration]

Ballistic Control System II
Ballistic Control System II
Power Diagnostic System II

Gistum C-Type Medium Shield Booster
Caldari Navy Thermic Dissipation Field
Caldari Navy Kinetic Deflection Field
10MN Afterburner II
Codebreaker I
Phased Weapon Navigation Array Generation Extron

Heavy Missile Launcher II, Scourge Fury Heavy Missile
Heavy Missile Launcher II, Scourge Fury Heavy Missile
Heavy Missile Launcher II, Scourge Fury Heavy Missile
Heavy Missile Launcher II, Scourge Fury Heavy Missile
Heavy Missile Launcher II, Scourge Fury Heavy Missile
Heavy Missile Launcher II, Scourge Fury Heavy Missile
Salvager I

Medium Bay Loading Accelerator I
Medium Warhead Calefaction Catalyst I
Medium Warhead Rigor Catalyst I

Tengu Offensive - Accelerated Ejection Bay
Tengu Propulsion - Fuel Catalyst
Tengu Electronics - Emergent Locus Analyzer
Tengu Engineering - Augmented Capacitor Reservoir
Tengu Defensive - Adaptive Shielding

The EHP may be low so you may be at a slight risk from gankers but you should be fine if you keep your wits about you when you fly and DONT AUTOPILOT.

This fit gets 448.3hp/s tank, against Guristas which is the main thing you wil be facing seeing as you live in Caldari space and will see you through all high sec exploration sites.
562 DPS, the target painter and rigor rigs are for the frigates. I got that figure from Fury ammo so you might want to change to faction ammo or t1 ammo if there are frigates everywhere.
Cap stable unless you decide to run the codebreaker and salvager at the same time. (Faction hardeners are needed for cap stability, but they don't cost too much anyway, I think Guristas hardeners may be a bit cheaper)

Plus this fit is well within the given fitting resource limit with skills are level 5 and with your skills I guarantee you can fit it.

Its also pretty 'cheap' for a Tengu and you can add faction BCUs for taste.

568 dps with faction, 495 dps with non-faction.
Fury is hardly worth it, highsec sites have mostly cruiser/frig rats.
Tanks 314 dps against Guristas, 265 against Serpentis, which is more than enough.

Salvager is simply not worth fitting, especially when you gain 20% more dps with the 6th launcher. Exploration is all about speed and being faster, salvager just slows you down for little gain.

tengu for hs exploration, what a waste get a faction/t2 cruiser or a battle cruiser it will give you the tank and dps you need to do these sites
since your in a tengu i would suggest the drake

Oh yeah I forgot about the probe launcher and its probably better than a salvager anyway.