Greddy types bov normal ?
 

I have a types and I get this result, after upgrading turbo.
https://www.rx7club.com/single-turbo-rx-7s-23/greddy-type-s-bov-405842/

put a stronger spring there or hook up that vacuum fitting line

it has the vac coonected, it sees 20mmhg. prooly gunna get type r., didnt know they has apeings

I've got a Type-S with no problems, are you sure you don't have it TOO tight? Loosen it all the way up and try again.