Ryu and Wesker

Im new to using wesker, and im having a hard time getting Wesker’s OTG gun assist to hit my opponent after i do an Air M,M,H,S with Ryu. Its alot easier to do it with Nemisis and Wesker, i can get it almost all the time…why is it so hard to get wesker’s assist to OTG with Ryu?

you’re probably just doing the MMHS too fast.