That's wild that you're getting such crap results with the China gate. For the money it may be worth replacing it.
I had the Monte out at the track last weekend and my c.2018 eBay "TiAL" 60mm is controlling 16psi on an 11 pound spring fine using an Innovate SCG-1 boost controller. I have other tuning issues to address the laziness... but upper rpm boost control is on point.