Still 4 stroking with an 84? Do you have a high flow filter? What intake are you using? I am running an 86 in my 15mm bing with the same setup (biturbo vs proma gp though). 88 jet did what you are saying the 84 does. I am over 150 miles in and through my 2nd tank and still see the hone quite clearly as well. I guess a few more weeks at 3/4 throttle.....