Default wifi issue

Hello fellow htc one users!

I have a problem (as you could have guessed).

A particular WIFI AP is working strangely for me (at work).

I get 25-30mbps on iphone's up/down
I get 25-30mbps on htc one with GPE (ARHD) 4.2.2 with stock kernel (or kernel that comes with it)

BUT

i get 0.5mbps on stock sense 5.5 and 6 with stock kernel and/or bulletproof down and 10+ (not 25) on upload.

Why is wifi speed, on same hardware and AP, slower on Stock? I have tried changing power settings in wifi-advanced without success.
Problem is the same with 2.5ghz and 5.

any solutions other then running GPE? Sense must do something with wifi.
Phone: HTC One X
Tablet: Nexus 7 and/or Asus Transformer TF101