I'd personally try to make something work with the H4350. RL22 is the most temperature sensitive powder I've ever used, so much so that I've quit using it.
I've found the same thing... or close... most temp sensitive to me has been H 335...
that notwithstanding, Rl 23 seems to be real close to the burn rate of RL 22
and its been temp insensitive in my use so far.... low 30s to high 90s...
