I have a somewhat similar problem.. although not at that high speeds. My isp gives me 50/50 atm, and disabling the limiter i get 49/46 (atleast on the isp bandwidth meter). I have set the limiter to 48/48, but when i do that, i get 44-46/36-38.
Ofc the download limit should be around that i guess.. but why almost 10 mbps less on the upload with the limiter running? Would the purpose of the limiter be kinda waste if i put the speeds more than i actually have? (i would think so.. but just asking)
Also tested this with 2.0.1 and 2.1 beta.
Oh, and im running PriQ setup, as i find this the easiest to manage.