Yeah, rather than price boost the speedy types, I'd be more in favor of price-cutting the slow types. When Sonic Steel Tidus existed, there was a way to easily abuse a slow team, and I suppose there's still Firefly on a tank, or Jane for every team that wants to gamble on Floors 3-4 for an uber team on F5... but slow characters are such a giant gamble. You can sort of get away with it if you have a single speedy statuser on the theory that masses of average speed PCs can be controlled that way, and the dungeon is balanced around not having to blitz bosses turn 1... but woe unto you when that status-user gets blocked, or when facing a ravenous pack of frail status-immunes you're supposed to blitz.
On that note I approve of the proposed discounts to Terra / Billy / KOS-MOS. Maybe drop Yulie to 1.5 as well? She's probably still a 2.0 in teams that can abuse FP Advantage, but still has that suspect durability + lack of speed, so I'm fine with Yulie at 1.5 that happens to synergize well with teams that use FP. There are still plenty of teams that would prefer Eiko > Yulie - average speed vs. slow, doesn't explode to physicals, status options, good damage that doesn't involve hurting herself, Phoenix's MT revival, etc. I already proposed a price discount to Lucca, and... though I'm less certain of this, since fast Omniheal + Revival + options is always good, DQ8 Guv might be movable to 2.0, just because speed matters *that* much.
I was thinking of some kind of all-slow team as the dark complement of my current team next. Suspect it would be amusing at least, but probably die horribly vs. the current Dungeon. We'll see!