Kral puncher w 5.5mm

Hi all, I'm new here and any help would be appreciated.
I recently got a kral puncher w 5.5mm and after shooting for a while I decided to upgrade it an drilled all the transfer ports bigger tested on a chrony before and after and the is a bit of a difference..
Was wondering how far should I turn in the hammer spring? The only way I can see a masive diffrence is when the hammer spring is almost turned in completely.... Tia

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