I, too, don't think we should all judge a book by its cover, as cliche as that may sound. If he's taking good care of them, which it definitely sounds like he is and is on top of things, he should be left alone.
I do, however, agree that the aquarium you have them in is too small for that many axolotls, no matter what way you wanna put it. I see that you're looking into getting a bigger tank and that's great, but if you don't have homes for some of these guys, you'd need quite a huge tank to hold that many axolotls, so you may wanna look into selling/giving some of them away to friends/family.
Anyways man, all your axolotls look to be in quite fantastic health, so your husbandry doesn't look to be lacking, they just need a bigger enclosure, and that should definitely make it easier for you, throughout your daily routine, and WAY better for them, since they look quite crowded and "snuggled up" for lack of a better phrase.
Lastly, the axolotls you guys have established are astounding! Their colours are amazing and damn that Albino with the white belly looks crazy! I wish we could someday establish that where I live in Canada, or even in the US and get some imported from there! Props to Taiwan!