I personnally zone (dagues cancel) a lot to be able to rush him down with a red dash. I use a lot ex-red dash to make anti-wake up coz most of them always use elbow or slide as wake up.
To punish elbow on block I'll use d1, 1, f4, red dash, up slash, f2, 1, 2, 1+2, red dash, up slash, upercut or 1, 1, 4 ex-dague cancel pressure.
Make sure to poke a lot with d3 (d3+slide sometimes) before using 2, 1, 2, dague cancel, 2, red dash, up slash, 1, 1, 2, blood ball or whatever.
When I'm jumping in him I like using down air dague against ex-forceball in case reptile would like AA me.
Anyway, to me the most important part is to zone a lot before rushing down, coz reptile can't do shit except ex-slide when you daguing cancel as fuck.