As someone who plays Sch, Blu, and been working on Rdm off an on. I see no problem with allowing Rdm to have even Regen 4, after all, Rune Fencer even gets it. Maybe even regen 5 if needed, so long as the +hp per tic for light arts stays exclusive to a Sch main. As part of what makes Sch unique and fun is that it is the Dot/HoT class for XI and you do have to plan ahead to get the most out of it.

The big difference I noticed in Sch and Whm healing while I leveled both, is Whm has the tools to react to a big nasty aoe or two going off close together frequently and/or often. Sch has to plan ahead by making sure a Regen is on everyone in advance maybe even stoneskin, as well as not being caught in Dark arts when it happens(though a main healing Sch should not be going into Dark arts unless need more dps to try and beat a timer). Sch can deal with this a bit thanks to accension. And Rdm is even worse off.

Maybe Rdm could do with getting access to foil(more so if accensionable). I would suggest giving Rdm a few new enhancing spells, but I doubt that would happen at this point. Such as Saber, either as a targetable acc/attack buff or targetable version of Temper. Could split into two different spells for the acc and attack if needed. A dispel 2 that can remove multiple enhancements would be good too. Stoneskin 2 and blink 2 might be additional candidates for Rdm provided they would be targetable(would also give Rdm its own unique healing style to of placing barriers to absorb damage in advance and would be beneficial for against mobs with fatal/near fatal spike damage)

Really on the enhancing side of things, the biggest strike against Rdm is majority are single target or self target only. So if their focus is mainly supposed to be enhance/enfeeble, why do they not get the aoe versions of them at this point? AoE cures and nukes I don't see ever fitting in on Rdm, but Protectra, Bindga, paralyzega, etc. I do see as very Rdm appropriate.

The enfeebling side, it seems to be more due to how hard it is to land them vs how easy it is for a Geo to inflict two key ones. I do have one big question here, and that is does Geo Enfeebles stack with other enfeebles? If no, something definitely needs to change, if yes all it should take is some adjustments to how hard it is for Rdm to land them(maybe via a job trait, like +accuracy for enfeebles only), and while speaking of job traits, would occult acumen be OP to give to Rdm if there role is to be a hybrid melee/mage?