On css crackhouse server I cant make my cl_interp set to 1.. Im on a constant 31.5 lerp and i want it to be default at 100 so that i dont get 1 out of ever 4 shots registering.

This servers automatically sets your lerp as 31.0 ms if you're using the CSS rate settings 66 and higher.
The only possible way to get 100 ms lerp back is using the default CSS rate setting (cl_cmdrate 33, cl_updaterate 33), but the game would be more laggy.

Dude, That's wack lol
Change that crap