Hey Mike, I just compared your settings at 21psi to your 28psi settings and something is wrong here.
At 21psi you were pulling out less fuel between 4200rpm and 5800rpm than you are at 28psi.
21psi of boost 4200rpm -19%
4800rpm -18%
5400rpm -15%
5800rpm -12%
6200rpm -9%
28psi of boost 4200rpm -19%
4800rpm -21%
5400rpm -18%
5800rpm -8%
6200rpm -5%
You would think at 4800rpm and 5400rpm at 28psi, you would have to pull less fuel than at 21 psi, but you are pulling more fuel.
Steve B.
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Custom 60-1 turbo
434hp 419torque @ 25psi
7.7@95mph 
Stock turbo, 295whp @ 21psi 7.9@88.8mph
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