Slowdown problems with games : driver related

Hello everyone.
I am not really sure where to post this thread because the problem that I'm having concerns the drivers of laptopvideo2go.
Here's my "story" : I downloaded nvidia forceware drivers from www.laptopvideo2go.com and after the successful installation, I actually noted a FPS increase of about 10 or 15 in games like Mass Effect and Command And Conquer 3 (only tested those). I was delighted but the day that followed, I played those two same games again (and I didn't change anything with the settings of the games), and both of them seemed to perform like before the drivers, which is, 10 FPS slower. Worse : they even seemed to perform slower than the original drivers.
I really don't know what to do, I've only tested with the 177.61 drivers and the 175.16 drivers with the modded infs from laptopvideo2go, and I've encountered the problem with both of these. I noted that it seems to be happening after a shut down or after hibernate mode.
The same scenario happens : I install the modded drivers ---> they tell me to restart, so I do it ---> I play the games and note the performance increase ---> I do something else, so I shut down or put the laptop to hibernate ---> I power it up again, and note a performance decrease.
I think there's something perhaps that's changing the values of the drivers, thus causing the slowdown. Any help would be appreciated.