Missions & Complexes

I haven't really done any PvP or ratting since last year. I only got back into the game recently and been losing my sec status quickly.

My tactic last year to keep my sec status in check was for every gank in low sec I kill one BS rat. This used to balance out nicely. At around -2~4.0 sec status I keep myself, every gank would net me a loss of 0.1~0.2 sec status (depending on whether the other dude shoot me back or not), and a BS rat would give about 0.1~0.3 sec status gain (depending on the bounties)

Now, this was last year. But recently I noticed that I get very little sec status gain for killing BS rats in low sec. For example, I was at -2.53 last night, killed a BS rat with 650,000 bounty and it increased to -2.50. This is very small increase compared to what I remember from last year.

Has there been any changes to the way sec status are gained?