It's also insurance / peace of mind for the 24 psi you're running at the moment anyway
In terms of full spool - with my less than ideal atp t28 flanged t31 v band outlet (2.5") 0.82 rear housing, I'm getting 28psi in second by 4700rpm and in 3rd by 4200
Swapping over to a genuine garret 0.82 rear t3 flanged inlet 3" v band outlet next week. Hopeful to pick up 500-600rpm of spool and 30hp up top
Mick