Doggg;
We went out today as we are on vacation. Got a good chance to try it out in rough weather. We were in 2~3 ft'ers, we went both directions (head and following seas), and around 20 to 22mph.
Before I did, I added another brace, and I think this will replace the straps.
You can see the one I made here. I used a 1ft piece of stainless tubing, because; well thats all I had. This is on the Starboard side. On the Port side, where the entry steps are, the piece can only be about a foot long anyway. The photo doesn't show it well, but the 1ft brace turns 90 degrees in.
I had some hardware left over, but I had to buy two end caps. West Marine wanted $20 each for stainless end caps, which is crazy. But they had nylon ones, so I bought a pair for $7. I can get those end caps from Sailrite at 1/3rd the price.
So I am going to remove the aft straps and add another 1ft brace on the Port side after I order the needed parts from Sailrite.
I have to say, even at the 1ft level, the rigid braces helped much more than the straps. There was no side-to-side motion at all when running the boat.
One thing I also did is that the hardware is a bit loose where the end pieces fit into the T-fittings, or whatever they are called. I took some duct tape (its all I had handy), and made a shim of sorts for the screws, and that helped a lot to tighten everything up as well.
I think I will look for some nylon or maybe tubular brass and try to shim each connection that doesn't normally move (i.e. everything but the two bows).

You can see here (I didn't have the Port brace on yet), due to how the stern rail turns into a ladder rail, the brace can only be about a foot long. But even with just one brace, it sure tightened the top up.
I didn't even try to "boot" the bimini as it rode quite well as it was. But I will caveat that the aft bimini is behind the flybridge (although it is about 1ft wider on each side), so I don't get alot of air to ruffle the bimini.
The only issue is the design of the front nylon straps is not as good as it needs to be (they won't stay tightened), so I'll need to rework those a bit. No problem, I just need to re-sew the end pieces with a different tightening mechanism.