In all fairness, you have carbs are way too small for the STR. I did one with two 650's and they were too small, but the customer didn't think that until we went to the dyno. I would love to do another STR because of what I learned on that one. I feel like I left 20-30 HP on the table, but when worked that STR is a nice piece.
I would think (and I will always say this) that a custom ground cam for your application would be a better choice. You have a very good thing going and you test and, from what I can tell from here, you test well. Think about a custom cam. I use on a regular basis these companies:
Racer Brown...Jim is a MoPar guy and is hard to beat.
Cam Motion...been using these guys since 1997 and never had a cam that didn't do what I asked.
Jones Cams...Mike Jones does some outside the box stuff at has experience I almost all forms of motorsports.
Bullet...these guys have all the Ultradyne lobes.
There are others but this is who I use. This is not a slam on Lunati. I'm just not big on off the shelf cams.