My DH had bad SA when we fist went to FS, lots of cone heads and very viscous. But about 12 months later when we saw our current FS it was all ok. I guess it depends on what areas the deficiency is in. He didn't take any supplements or anything, so we are not sure what he may have done to improve his results!
I'd check with your FS re IUI just to make sure. Ours is only $1500/cycle, and you get about $500 back, and hit the safety net after one. Feel free to ignore me! Keeheehee. I'm not sure of your situation just trying to give some helpful advice!
Hugs....I hope you can get some advice/strategies/solutions!