150 psi isn't all that bad, and will likely get a little better after it breaks in some. How many tanks have you run through it so far?
Some flaws can be expected with this stuff. Some corrected and some just lived with. But not at the prices Hyway is charging.
I don't expect "equal to OEM" performance from AM kits. I think that's asking a lot, especially from the less expensive kits. But I do think the minimum should be a usable saw, and some kits even fall short of that. IMO if a $50 kit turns a dead saw into a live saw that you can work with you did OK.
They should for the most part be useable "out of the box", and I think that if a simple gasket delete can solve the compression problem that's acceptable. But that doesn't always work. A guy came in the store on Sat and told me he had a 52mm 372 kit that had .062 squish with a gasket but freeported without the gasket. So, the kit was useless. And it was a Hyway.
Sometimes there's some funny psychology in play here. AM parts are chosen over OEM with the intention to save money. But the money saved is often spent on another saw to add to the dozen or two saws that the guy already owns. LOL