This has been a problem for years on DET engines. Realistically there is no real solution for this issue, where it normally happens at high rpm rev's, 2 step, anti-lag. The only real solution is to switch to the VVL cylinder head.
If you must stay on a DET cylinder head, your options are doing the dual guide conversion (basically running 2 guides instead of one to try and keep the rocker in place), on hydraulic lifter setups switch to a solid lifter setup (GTi-R's are already solid) with the aid of the dual guide conversion also.