The only tanky caster I can think of is maybe Oracle, and even then I don't think high movement suits them that well.
The other option is a redesigned scholar/battlemage. 4 movement would be right at home on a caster with Clairvoyance/Awareness and innate access to shields.
[We] could add a Talk Skill that could add Reflect maybe MA + 65% of the time or something.
Thank you for the Reflect critique, silentkaster. If Float is only applied to avoid spells mid-charge, then a skill that applies Float should certainly have 0 CT. As you suggest, a talk skill would be perfect for this. Considering its situational application, this talk skill should probably be both cheap (~100 JP) as well as accurate (MA+75 or so). As a counter, we could add Cancel: Float to Don't Move, as WKW suggests. Don't Move would become something like gravity: It makes the target so heavy that they are forced to the ground and can't move.
To push Float into the metagame, it would also help to move forward with the Titan buff, so people start using Titan more often (or at all).
Last, I threw together a few spear ideas, some of which are based on CT5Holy's suggestions:Jumping Spears
(none can be used with Two Hands)Javelin
: 9 WP, 10 W-EV, +1 SP
, +2 JumpObelisk
: 11 WP, 10 W-EV, +2 PA, +1 JumpDragon Whisker
: 14 WP, 10 W-EVPoking Spears
(all can be used with Two Hands)Blood Spear
: 9 WP, 10 W-EV, 50% Cast: Life DrainHeavy Lance
: 10 WP, 10 W-EV, 100% KnockbackGungnir
: 10 WP, 10 W-EV, 50% Cast: Last Dance OR
50% lower CT by 30Holy Lance
: 10 WP, 10 W-EV, Holy element, +1 SP and Holy Breath proc removed