I found my DEX410V3 (big bores) was significantly better when I ran drilled pistons.
On a bumpy grass track I used 6 hole kit pistons drilled out 1.5mm & it was pretty good. I did drill a set out to 3 x 1.7mm but never got to try them - may have been even better...
I'm sure there's a comparison chart on Petit RC.
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