I'd be real careful using Turbosmart wastegates or any wastegate with a small ratio of diaphragm to valve ratio. The ratio of diaphragm size to waste valve size has a lot to do with the gate's ability to stay closed as exhaust pressure increases.
I put a Turbosmart 60mm gate on my single turbo system and had very poor control. The hotside pressure would push it right open. It was a real pretty valve but had too little diaphragm size for the valve size. It had almost no size ratio between the dome diaphragm and valve, and that makes control stability poor.
I made an adapter to bolt my old RG-45 Turbonetics gate back on and control immediately was and still remains perfect. This is because the diaphragm to valve diameter ratio is way larger in the 45. The RG-45 will sit right on dialed pressure all down track. If I dial a certain target with dome CO2, boost goes right there and stays.
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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)