New compound build questions.

[russcone]

Just finished building my compound setup and finally put a few hundred miles on it. The setup is my old htt 66/73/13 I ran as a single with a box s475. Truck spools better just driving around and towing then it did as a single. I'm seeing 55psi total boost and 30 from the primary. The truck definitely pulls harder in the upper rpm. I know the 66 is a little large as my secondary with my fueling and it being a t3 doesn't help but what would I see by adding g more/less to the waste gate on the 66? Also what type of difference could I expect if I could get my hands on my old Ed 63/68 and swapping the 66 out?
Truck is a auto 06 with 100s and a 10mm pump

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[russcone]

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[MBusse]

I would say you would spool alot faster with the 63. My brother has a 63/475 setup and its fun on the street. He made 742 hp with efi, stock cp3, 90hp ddp nozzles and no lift pump. Runs 12.30s. With you having more fuel upgrades you should have a very usable 800hp.