Ok I was board at work so I just tried this on AE for PC.
LP, LP, MP 148
LP, MP, MP 153
LP, LP, HP 148
LP, MP, HP 153
LP, HP, HP 158
MP. LP. LP 153
MP, MP, LP 153
MP, MP, HP 158
MP, MP, HP 163
MP, LP, HP 153
MP, HP, LP 163
MP, HP, MP 163
MP, HP, HP 163
HP, HP, LP 168
HP, HP, MP 168
HP, MP, LP 163
HP, MP, MP 163
HP, MP, HP 163
HP, LP, LP 158
HP, LP, MP 158
LP/ MP do recover slightly faster. I have no way to know the correct frame advantage but just looking at the character after the 3rd rekka Fei recovers quicker with LP/MP as last rekka hit. Fei is in neutral position as they are “about to start” there bounce when you end the 3rd rekka with LP/MP. Now when Fei end’s with HP, the other character has “started” his bounce. So I would agree its like a 3/4 frame advantage after a 3rd rekka if you end it with LP/MP