HFS-3 with big fuel injecters

[TJ]

I hope every one is doing well.
My HFS-3 Installed and adjusted by my tuner on my BT Audi B5 S4, to inject 100% meth. Running +2 bar boost, the HFS3 is not activated until it reaches over 1 bar boost, I would like to make it come on earlier, tried by adjusting the THRES but it is cranked all the way counter clock already by my tuner. Is there any thing else that can be done to make it activate any earlier?
TJ