Tamara,
1911's ruled IPSC long before there were comps. and open class. In the pre "race gun" period, the only top shooter of any note that shot anything other than a 1911 was "Tommy-Gun" Campbell, and he was factory sponsored by S&W and obliged to use their products (and his guns resembled a stock model 39 or 59 as much as a modern race gun resembles a stock 1911).
Your 23C is ported, isn't it? If so, it is an unfair comparison to your non-ported 1911's.
In the competitions that I am familiar with, the 1911's (in non race gun configuration) are continuing to dominate, be it IDPA (CDP and ESP divisions) or IPSC (limited 10 division). Heck, why do you think that IDPA and IPSC have these other divisions? It is because other types of guns, on average, are not able to compete with the 1911 as a platform for delivering multiple hits on multiple targets from a variety of positions.
You stated that "In putting rounds on target fast, I'd give my G23C and P7M8 a better than even chance against my steel-framed, single-stack, .45 caliber carry 1911's." In your hands, maybe. In the real world of competition, with empirical evidence to back it up (rather than speculation and conjecture), the G23C and P7M8 have been soundly beaten by the 1911.
Given your reference to IPSC competition guns, I have to ask. How much competition shooting do you do, be it in IPSC, IDPA, or "action shooting" competitions? Are your G23C and P7M8 beating out the 1911 shooters? Do you have first shot and split times with your guns telling you that your G23C and P7M8 are faster than your 1911's, or is this just speculation on your part?
Inquiring minds want to know.