Reimu/Marisa/Sakuya look good.
With Patch, the end part where you say picking specific elements for best effect; well, actually, Silent Selene or Royal Flare is pretty much always the better choice for bosses. Silent Selene factoring in only /4th MND should be fixed in the formula, as well; it still says /2.
Princess Undine is almost equal to Selene for bosses weak to CLD, except for Selene's /4th mnd formula, and it's much better Delay which is great. Undine is the better choice for the two or three(!) early-game bosses weak to CLD, because of MP reasons. And I suppose against enemies weak against CLD because :multitarget:, but often you won't care enough about randoms to know if they're weak to CLD anyway.
Djinn Gust is 9 x (MAG - 2/MND) on something weak to wnd, which means whether it's better is situational due to MND. In Plus-Disk, where Patch's MAG should be massively overpowering, anything weak to WND might actually take really heavy damage to this; I know 27F, which takes forever to explore, has WND weak enemies. Someone should see if this can be useful in that case.
Satellite Himawari has a normal formula, just a little weaker. It might actually be a better choice in many situations against NTR-weak stuff. With 16Fs high mnd though, Selene is probably still a better choice against her, especially because better delay and Patchy's snailness; thought I should throw that out there, since that's the most notable NTR-weak enemy.
You should probably just stick to Selene for bosses, Flare for FIR-weak/multiple-bosses fights/randoms. But if you have specific knowledge on enemy weaknesses, or they're resistant to FIR, then you might get a little use out of the other spells for randoms. They're still mostly only good for conserving MP early game, though.
About Remi, I just thought it should be mentioned that with her great SPD, 50% delay on her attack, and ability to tank+damage, her damage output is a good bit better then the numbers suggest.