any other yaoi manga recommendation with height gap like this??

You could try using the tag for height difference :)

im not sure if these are to your liking but here are some i thought of ٩(๑❛ᴗ❛๑)۶
http://www.mangago.zone/read-manga/shiba_kun_to_shepherd_san/

http://www.mangago.zone/read-manga/room_to_room/

http://www.mangago.zone/read-manga/boku_no_kawaii_yopparai/uu/boku_no_kawaii_yopparai-chapter-1

ah i dont know there is a tag for that, thank you sir:D

thank you sir(=・ω・=)