haha i got looooots!! i've collected them over here http://www.mangago.zone/people/tag/49344/macho+uke/
#130-140 Bit Bara
http://www.mangago.zone/home/mangalist/527/
Hmm...If you mean pure Bara by that then I recommend trying Grore_Whore "Lovely Bara manga" collection - http://www.mangago.zone/home/mangalist/26410/
BUT, if you mean just bigger built uke with muscle with bara-ish feel then I recommend trying ALL the mangas Sakira. Her works have ukes like that - http://www.mangago.zone/r/l_search/?name=sakira
AND if you mean just normal typical yaoi where the uke is physically stronger & bigger than the seme then you might like this cute one - http://www.mangago.zone/read-manga/nirameba_koi/
Suddenly I am thinking to read yaoi manga which the uke is muscle man.. (づ￣ ³￣)づ suggest those manga to me~~~~~~