I wish to see your result not against single-shoot DFB or chain lightning, but :
- elite traps in new content, e.g. Sins
- lots of FB and other dmg, e.g. Enter the Kobold end boss room
- Cometfall or any untype damage that we have no way to save (or reduce damage) without high reflex save/Dex
other than the traps, I would accept your reflex save is good enough if you could save the attacks for 80% of times on normal. (and your HP is good enough to survive the other 20%)