OK, you've got "free" brass and you want to use it. You want heavier than standard loads, Fine. You've got the gun for it, and have been warned about the possible reasons why its not a good idea. Fine.
Now lets look at only the mechanical aspects. First point, in the Redhawk, you're firing ACP in a .45 Colt chamber.
.45 ACP is spec'd to go .473" at the case mouth and .476" at the head. The .45 Colt is .480" and straight. You are, essentially "hanging" an undersize case in the colt size chamber by the moon clip's grip on the acp case.
Not an ideal situation, even at standard pressures, but it does work.
Next point, you want 1100fps loads, using ACP brass, and you want to use plated bullets, in a revolver. First off, the Redhawk is a big, heavy revolver, so a light roll crimp MIGHT be enough. It's also possible the usual taper crimp will be enough. The only way to know is to work up the loads in your gun and see what is needed to hold the bullets in place during recoil.
Next point, plated bullets. Your call, I'm not a fan of plated bullets, I use either regular cast, or jacketed. If the maker says they're ok up to 1250fps and you're shooting for 1100fps you should be ok. But I'd recommend working up to your desired level in small steps, carefully watching what the bullets actually do, not what the maker says they will do.
Last point, your desired 1100fps velocity. I didn't see where you mentioned the barrel on your Redhawk, but if its at least 5" you've "got a shot".
I've got old Lyman data showing a max charge of Unique pushing a 200gr cast bullet over 1,000fps from a 5" Colt Govt Model (.45ACP) and the same powder charge and bullet just under 1,000fps from a 5.5" revolver (.45AR brass).
SO, you should be able to get 1100fps out of your gun with acp bras, carefully working up to that, in small steps. The main factor to watch out for is how much your ACP brass "swells" and where as you increase the charge.
the other thing to watch for is shorted case life from the firing/resizing cycle. ACP cases are being worked more when fired in the .45 Colt chamber than in an ACP chamber.
I've got a load of Unique that I won't list (over book max) that clocked a 200gr JHP at 998fps from a 4.25" barrel Sig. Other than "snappy" recoil function and case appearance was normal. Same ammo fired in a 1911A1 Pin gun cratered every primer.
Worked up to, properly, in your gun I'm sure you can get the 1100fps you want, but it will be a load at or above listed book max for the .45ACP.
Good Luck and be safe!