How about:
- "10 Dance" ( http://www.mangago.zone/read-manga/10_dance/ )
it's one of my favorites! it's still ongoing but the main couple is exactly what you describe. you can't tell who would be the seme at the end :) if you are ok with slow pace then you should give it a shot (●'◡'●)ﾉ
I'm into that and those types of men are littered in my list and tags. I've read lots and mark things as i go on so you'll be able to find plenty of them. One of such is http://www.mangago.zone/people/tag/49344/manly+couple/
http://www.mangago.zone/home/mangalist/484/
I pick by base on their personalities, not look.. So some may look cute but for sure they're not weak.
it doens't need to have buffy strong ones, I just don't want that "bunny" or "cute" type of uke... It would be nice if they have the same height, but anything will help me, thanks!!