Hello B.. I just wanted to comment on the "itchy" factor. Don't be so sure that your son is complaining of itchiness because his skin is being pulled tight. The hair grows below the skin from the follicle, and what grows out from there is the actual hair shaft. The hair is anchored at the follicle, so there shouldn't be any tugging of the skin once it emerges. With that being said, your son most likely (I'm willing to bet on this)just needs his scalp greased. There are a ton of greases out there, but when my daughter was very little, I used African Pride on her scalp. It smelled great and worked very well. That was 18 years ago, so there is probably new and improved items out there, so choose one that is thick. The scent should only be an added plus :) and is not important - relieving the scalp from irritation is, though. The "ethnic" hair lotion is fine for the curls, but his scalp is what needs to be tended to first and foremost. I hope this helps :)
p.s. - after re-reading your post, it appears that you are washing his hair every night. I may be mistaken, but that's how I read it. Maybe you're just getting them wet, and maybe you're actually washing his hair every night, I'm not sure but in any event his hair shouldn't be washed daily. Black hair is different than any other hair and thrives on the oil that is produced, so washing it often is not a good thing.