Hi Oldbones, have same problem as you and lost the front on a track session last week when the forks bottomed out, i only have the standard ST forks (Not an R) and have been seriously thinking about getting them re-worked and modified by MCT Suspension as this was the second time in less than a year i've had a front end get off.
Did you re-work your own forks with heavier springs and new oil?, what did you use?.
I am getting to a point where am seriously thinking of selling and trying a R model than will allow more suspension setup as can't afford another off and the repair costs. Hooning around on the road is perfect for the ST which is why i bought it but for a few track days each year in the inter group its showing limitations with the front suspension. Have thought about transplanting an R front end in but its just not cost effective.