The problem is, at the low levels of EfU, these classes can only really be dipped into very slightly if you want to keep any kind of spell progression; having once tried hilariously to play a wizard 3 / pale Master x, even with the changes to ensure necromancy spells had pale master included in the spell level, i had barely any spells, very low circle even at 8, and very few spells per day.
That being said, pale Master has been adjusted to give them very powerful bonuses on EfU, albeit bonuses that almost certainly favour some kind of bard or bard/fighter build, while RDD naturally swings towards that kind of build anyway, which I would say is not necessarily a bad thing. Sorcerors get various perks which allow them to be a necromancer without really needing the pale Master class, alongside ones that help the more combat-oriented nature of RDD.
Rather than change those two PrCs entirely, I'd suggest adding a secondary pale Master level progression, similar to how I assume Ascetic or Ritualist works which gives less bonuses but allows a wizard to keep their spell levels, or add new, more spellcaster-focused PrCs that allow a Wizard to keep their spell levels while giving them bonuses in certain areas; a PrC to focus more heavily on one spell school at the cost of others, a PrC to make a compact with some outsider or aberrant that, though giving them more power, slowly turns them into monsters that most PCs would despise, etc.
Although I don't really see this as a massive problem, both sorc and wizard are pretty good as it stands without PrCs.
That being said, pale Master has been adjusted to give them very powerful bonuses on EfU, albeit bonuses that almost certainly favour some kind of bard or bard/fighter build, while RDD naturally swings towards that kind of build anyway, which I would say is not necessarily a bad thing. Sorcerors get various perks which allow them to be a necromancer without really needing the pale Master class, alongside ones that help the more combat-oriented nature of RDD.
Rather than change those two PrCs entirely, I'd suggest adding a secondary pale Master level progression, similar to how I assume Ascetic or Ritualist works which gives less bonuses but allows a wizard to keep their spell levels, or add new, more spellcaster-focused PrCs that allow a Wizard to keep their spell levels while giving them bonuses in certain areas; a PrC to focus more heavily on one spell school at the cost of others, a PrC to make a compact with some outsider or aberrant that, though giving them more power, slowly turns them into monsters that most PCs would despise, etc.
Although I don't really see this as a massive problem, both sorc and wizard are pretty good as it stands without PrCs.