Only those two, sorry. Normally, they should work one way or the other. I haven't read the whole Avsim thread regarding the newer one, maybe some error sources are named there.  :-/

If you only use the internal FSX limiter together with the tweaks, you'll lose some overall fps, but your textures should be fine. Maybe this solution works for you then.
The drop is noticeable but you still should be ok on the fps most of the times and using this internal limiter will always make sure that textures come in sharp.

There was a guy running this together with some other tweak, fiber frame time fraction (FFFT) set to 0. That was very smooth and fast, but caused huge blurry areas in some scenarios while being overwhelming good in others. I never got that working in any situation though.
http://forums1.avsim.net/topic/283565-fftf0-tweak-against-fps-drop/
As you see, the tweak aspect always is a game of tradeoffs.