Personally I found Tactician to be ridiculously easy, and I haven't even tried a lone wolf or all physical build.
I do agree equipment should come from fights and such rather than shopping, but I definitely don't agree that enemies should follow the same "rules" as a player in regards to equipment - What happens when you're fighting a non-humanoid enemy that doesn't wear armor? E.G. a demon? Should they have 0 Magic/Physical? Or the scarecrows? Should they drop their straw?
When I play DOS2, I play it for the challenge. If enemies have the same stats as my own characters, then the game would certainly be far too easy. Unless my own damage was heavily nerfed as well. But then we'd end up right back where we started, just with lower numbers so things.. What, feel more balanced?
For the record, again, enemies on Tactician only have 50% more health/armor over classic. So if enemies have double your armor and triple your damage, if you take away 50% of that it should be ~40% more armor and double your damage. But that, according to your own words, is too easy. And you think it should be lowered further?
And as far as loot goes - why would you give people better loot for wanting a challenge? Doesn't that just make the game easier, mitigating the challenge, and thus we're right back at the same difficulty as classic mode just with higher numbers across the board for both enemies and your characters?
