Hello HighFlyer,
Like you I've used various tweaks including Bejote's and, whilst I've seen improvement, I've been a little disappointed with the results.
I recently followed some YouTube tutorials by a guy called Rotation FSX. He has several covering DX9/10, rain and so on. I implemented the DX9 & 10 tweaks, but rolled it back to DX9 due to issues with my dual monitor setup. (Probably something I was doing...)
Anyway, I'm really pleased with the results. I'm getting a solid 30+ fps, but it's so much smoother with less tearing and blurries. Check it out.
My system is not as strong as yours, so you should get some good results. I use GEX, UTX, PMDG & VoxAtc.
Good luck
GIO