Thanks for the suggestions. It's not super lazy. It needs at least 3 seconds to get a solid boost number.

Here's a video of our testing during the rain. We waited until it got dry but it never did.
So we tested in the parking lot of shop on the wet cement.

The 1st video shows the big turbo in the back and the other is with the big turbo in front.
You can clearly see how loose the stock 4t65-HD converter is vs the 4.6L Northstar converter in the back.