Try to do 2146P instead. Something similar is that to do P+K 43T 6P yo can do P+K 41236T 6P. Also I time correctly 23P P doing 236P6P, but this last is really weird.
I can actually do around 80% of those combos on pad. One thing I can't do is combo into 346P off a standing move. That's impossible on pad, I've never been able to do it.