A 90 degree sear set is very expensive...
I don't even think you really need to upgrade any internal parts if you just want it to shoot straight. It'll hold for a while. Just do the DIY mods and maybe sorbo on the cylinder head to reduce the impact a little bit.
If you want accuracy it's mostly in a consistent hop unit. Shimming helps a lot here. I made my own hop arm because I was sick of fussing with shims..
I use a 45' sear set (EDGI) with a lower spring (sub 400fps) and I shoot straight every time.
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