My fault. I was mistaking their 7-B versions with their 7-A versions. I was applying the logic that his kidou should only attain 7-A status with their complete incantation, as those were the ones capable of harming Ichigo, who was comparable to him.
In CQC, I'd say that they're about even. Mukuro consistently goes toe to toe with Hibari, one of the best CQC fighters in the series (who's likely superior to Aizen in that regard). He's even used his illusions, even from the first arc, to take quick advantage during CQC encounters, and he could do the same with Aizen.
In they have the same AP and comparable dura, then there shouldn't be any 'erased by his spiritual presence' as that only occurs on someone decently weaker, which is not the case here.
The illusions that come to life are of comparable dura, but yet his illusions are enough to change the entire landscape without Aizen noticing a difference. Once again, such was shown in the future arc, where he essentially had the entire battlefield in one giant illusion, recreating it to make it seem as though all of his allies had perished in order to gather them all in one spot.
As far as experience goes, Aizen might take it. However, Mukuro has stated in the manga to have gotten his six paths of reincarnation through going through six lives. While unquantifiable, it should stand to reason that such a feat would likely even out the experience gap considerably, especially as it's a common theme in KHR for younger enemies to best more experienced ones in terms of skill alone.
I still think you're igorning his arrogance as a factor here. Chalking it up as a 'no touching' mentality does not erase the fact that it makes him less observant, or as overestimation of his power, which is something that Mukuro is easily capable to taking advantage of. Especially considering he is able to project illusory clones of himself, which could be used for mix-ups.
As for his trident, what I was trying to convey is that if he physically blocked it as opposed to dodging it, and was even slightly grazed, that would be it. I see that, in conjunction with his illusions, being at a far higher rate of occuring than Aizen catching Mukuro off guard with a lethal blow.
