For the first combo, do like b34, slide, f4 xx slide, f4 xx slide, f412 xx slide. Should be more damage.
On your corner combo, I doubt you'll be opening people up with raw forceball, but universally reptile gets ~40% one bar. IMO never do f211+2 ex unless it's a starter, or off of b2. But off the top of my head, forceball, NJP, f41, f412 xx ex slide, f412 xx slide will prolly do more damage than your combo.