Tuning Fx wc mk3 difference between gen2 and gen3

So I have a wc mk3 gen3, brass reg
It’s not giving me the same or as good performance as my mk3 gen2, amp reg

both sniper .22 

Gen2 mods were huma reg with spacer (amp), huma transfer port (not the current v2 tp, but the previous one which I think was slightly smaller). This shot the jsb ko perfectly accurate at 965fps with reg around 135

This new gen3 has huma reg, v2 transfer port and probe (left one). This isn’t as consistent as the gen2 wc nor as accurate with the same ko slugs 

Maybe I’m using the wrong huma probe? Anyone using the huma tp with the standard fx probe?

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