The less boost you want the bigger the waste gate.
I'm sure this varies a great deal with the combo.
A single Turbonetics RG45 dumps my hotside pressure enough to stay around 18 psi boost with the BW turbo. On the line it goes down to 9 or 10 with the large spring and the screw at minimum pressure. I have not tried to go below 9-10 psi boost. Down track it will not bleed off enough to hold it at 10. It will creep up to 18 or so no matter how loose the spring.
Above 18 psi I can make it flat all the way down the track, but this is with my engine and my piping. Yours will be different. Since I never run below 17-18 down track I don't care. If I wanted to stay at 10-15 I would need a bigger gate or two gates.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)