Sorry I am responding at a disadvantage from only my cell phone while out of town. I would expect the combined CG of your 900 lb inboard and outdrive to be several inches to a foot forward of your transom. Bushwacker’s CG moved about a foot aft when he moved his ETEC 150 from his transom to a Hermco bracket. Therefore when you put two ETEC 150s on a bracket I would expect a bigger change than the 1.15’ you quoted. My 20” G1 ETEC 150 weighs 418 lb. The G2 must weigh more than that with power steering.
I agree with those recommending a large single instead of twins which I suppose opens up more space on the bracket for climbing onto when in the water.
The bracket floatation will not help your CG when underway.
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