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It’s not absolutely crucial to bias at 5v all FETs vary wildly even from the same batch

You can experiment with Q1 and 2 and bias them slightly higher than Q3 to around 6.5v to 6.7v to see if that makes a difference but my personal opinion is if it sounds good leave it

I biased mine higher than 5v when I built it

If you really want to try some additional series resistance you could simply tac a resistor on the underside of the board between TR3 lug 1 and Q3 drain obviously removing Q3 first, I’d start at 2K