Cast, and only cast, can kill slimes faster but not divide a full group easily and fast with a multidirectional AOE for exp + chances of a red one, then killing the whole group just as easy no matter how spread they are, so, if anything they're better for moving to the next area asap, but worse for farming.
Olga is not "extremely difficult with techs" 340+ damage spamming barta iic withouth missing, large range, and better aiming than guns is ok, it's not the fastest but it's extremely fine. And for the second form...LOL. Try Gizonde, thank me later, don't look at the numbers, just keep using Gizonde. You can try the same againsnt Sil, Gol Draon, and 2nd Faltz btw.
A caster with Razonde will eliminate a group of 6/8 spread gunners withour following around, aiming, or one vs one them, doint it faster with any other class is either impossible/they have to group together willingly, so, not really.
I admit though that I don't remember exactly Ult Bringers resistance or Griphon's (although I do remember doing damage to GG with Grants, Gizonde, and maybe Barta, although, maybe not spectacular) but those alone don't make a good case. Above examples are terrible examples about "why a solo nuking force is underpwoered" as explained. Seaside was Grants bait, while Mountain/Jungle/Seabed was Gizonde bait + Megid bait, Temple + Spaceship are irrelevant in terms of farming exp, and most times, gear. As a nuking Fo you had incomparable times clearing groups on Ep 1 and half of Ep 2, having to stop your momentum only on some midly resistant heavy weights, which I admit can put a Ranger slightly ahead, but only a correctly geared one, while on Forces...it doesn't matter.
I'm not experienced in Ep 4 and for what you say seems a very good adition for Fos, so, I plainly admit that they don't look bad at all in here.
However, about the Ult HP thing (straight punishing solo players) I could't disagree more and the argument doesn't hold well. You seriously think that 3 Racast with a Fo will make it through any level slower than solo? lol. I've played "doubles" with myself with a Game Cube controller out of curiosity, and, even as a solo Ramar that doesn't have the ATP of a Ractast OR Traps, normally a single FO casting S/D/Z was enough not only to compensate but to buff you beyond the stats of multiplayer and make you straight stronger than in solo. 3 Racast with Shots and traps will be literally a fucking joke. Also, most people don't really solo PSO (they're to bussy with duped Spread Needles on groups and not learning the game at all) so, what are your fears? that the whole comminity will solo EZ one player mode and take all the good stuff? not happening because the above reasons. You're just ruining new character creation for people who enjoy solo, and breaking the natural game progress as it was, and as said for no reason, because people will KEEP playing with groups no matter what.