It's likely that no Ash'aman is nearly as skilled as any Aes Sedai as the most senior of their member has channeled for less time than any novice. That said, AS don't know squat about saidin and vice versa... it's likely all the circles were completely inefficient at melding the two Powers.

It proves nothing, and it's absurd to think that ALL the quotes on this issue are incorrect, especially from people who actually know how strong they all are. We know for a fact that the Companion doesn't know how strong Cadsuane is, and there are several other potential mess ups like Rahvin. I would go as far to say that the Companion should not be considered canon on several issues, as well as the last few books of the series. I think it's a very valid point stating that the original author had no part in the verification of these facts, and clearly many of them have been messed up. For instance, Graendal with her angreal fought a few average Aes Sedai and killed one, and yet she managed to hold her own in the Last Battle against an onslought that included Cadsuane AND Talaan, and without her angreal. It's completely absurd and BS did less than basic research into the OP before he wrote his part. There are many other OP errors (Taim can't be shielded by will alone, for instance) in the last few books, and his answers to fans have also made me cringe in the past. I'm sorry if it sounds bitter but I suspect you two both agree that RJ's legacy has been handled horribly since his death.

Cadsuane's angreal logically makes her a ++1. She could deflect the power of any attack that hit her, and there were at least two ++2's going for her.

It's likely that two AS fall well short of a ++1 - we have actually seen Rand squash two at the same time like flies while feeling dazed, and with shields no less. Lews Therin himself says that he can handle three women if they aren't too strong, and one must be Forsaken strength to make his life difficult. That is highly similar to Egwene's statement that she could not overwhelm a Forsaken linked to Romanda and Lelaine, considering all three of them are weaker than even Moghedien. We also know from Liandrin that it will take about three of them to smother Moghedien.

We know that Amys' strength is vague in the series - one quote placing her alongside Moiraine, the other alongside Sheriam. I see nothing ridiculous about Egwene being able to overwhelm the two if she has a strength of 80 and they are at 40-50 each.

We also know that everyone has horribly underestimated the skill of the Forsaken. Alivia is stronger than Cyndane in raw strength alone, and even with a strong angreal and many protective ter'angreal she barely escaped with her life. I have strong doubts whether we can make any conclusions from the Cleansing. We only had a glimpse of it - we know from RJ that Semirhage also fought some of the circles, for instance. It's possible that Semirhage killed Eben or Kumira - it's chaos that we witnessed through a keyhole. We also don't know how powerful these mixed circles are, but it seems like the amplification is substantial.