I use Fleche and Contre Sixte at the beginning after some Veraeros and Verthunder
Acceleration> Veraero or thunder> Fletche> Contre Sixte> and so on. With procs when i cast them (no jolt use here) your opposite spell will be fast, so VerFire Proc> then i use aero or depending if for some reason your mana is not close to being on par i would use impact
Suetan is correct about the hardcasting, though doing stuff like dungeons you may not get the chance so just acceleration> Jolt2> aero or thunder in that case.

In many of cases also, Contre Sixte is ready when my melee combo is so i use then.
I often see Red Mages go in for melee combo and this is at like the beginning of fights so they are like at no greater then 20 on mana, such a dps loss..