"when Convert/Ethers are on cool down". As outlined in OP.

Also fairly straightforward what to do with Convert or ether-y things.

Convert: F1 > Flare (any PIE), F2 > Flare (250+ PIE), F1 > B3 (transition into single-target)
Hi-Ether: B3
Mega-Ether or higher: Flare