I have an Ace conversion unit that I bought many years ago for my 1911 Colt. It does increase the recoil but it still is not at .45 level. My original floating chamber broke but I managed to find a replacement part which has held up so far. I don't use very much as I now worry the part will break again.
This is the biggest problem with the whole floating chamber design with the Colt Ace pistols. They are prone to breakage. And it's very difficult to find parts to fix them when they do. And with each passing year it becomes even more difficult, as parts for these relatively rare pistols continue to dry up. This is why most collectors who own them, rarely if ever risk shooting them.
And when they are shot, it should be done with the lowest power .22 ammunition that will reliably cycle the action. High performance .22 ammo like Stingers and Velociters should be avoided at all cost. The problem is people who do not understand the inherent weakness of the floating chamber design, will actually do the opposite, and shoot high velocity ammo to increase the recoil effect. Because as you mentioned, they don't produce the same recoil of a .45 ACP 1911. They produce more than most other .22 semi auto's. But not the same.