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I recall that the 125/150sx calls for 1:40 mix ratio, but I can be wrong. Check your manual.

Which spring is it compared to on the dyno? Green?

Whatever you do.. Don't buy the vod cause it's barely watchable either! Lags like crazy.. Resolution is good but man.. Sometimes it looks like slowmotion pictures! I want my 150$ back.

I did check squish on my stock 250sx 2017 and got just under 2mm (!) which equals to almost 0.080" said google. Having trouble jetting my bike aswell, especially since I run some more technical stuff in cold Sweden atm. Stock jetting has worked good on faster motocross tracks earler this season but it loads up bad in the woods...

Sounds to me like you have the bike set up a bit too much front end biased with low sag numbers and also forks high up in the triples. I would start going to atleast 103-108 sag and put the forks at the 2nd line. What pressure are you running? Also the aer48 fork will not feel as soft as...

Speaking of setup tips, im nearing an top end check /replacement. Does anyone know what squish I should aim for with the base gaskets. I meassured squish stock and it was about 1,9mm which seems a bit much even with pump gas.

What oil are you using? I wanted the best for my new 250sx and bought Motul 800, but found out that you really have to keep the bike on high rpms with that oil.. Spooged up like crazy when woods riding for example. Now im using motul 710 1:50 and the plug is dry and no spooge in silencer.