Any reason why you went the route you did with Dwarven Focus? Why not just go with Advantage?
Dwarven focus was a tricky one. The original AD&D power was:
While performing tasks that are directly related to his focus, a dwarf receives a + 1 bonus to all his saving throws and a +2 bonus to all his proficiency rolls (or + 10 to any percentile roll).
So, we're staying true to Focus by having it modify only saves and skill checks. I went with a scaling system that would get better as the dwarf got more skilled, virtually assuring that you're going to have a hard time deterring a dwarf with a Focus. Admittedly, at 9th level, the dwarf is getting a base +8 to all saves IF, and only IF, that save is directly tied to thwarting the Focus, whereas Advantage has been calculated as roughly a +3.3 modifier on a d20 roll. But, if run properly, there may be entire sessions where Focus doesn't come up at all.
So, it's strong when you have it, and much of the time, you may not.
I know 2nd edition Half-Elves didn't get much, but this version feels a little sparse.
The half-elf never gets any love in any edition. This version is as close as I could get to the Dark Sun half-elf, which had the ability to Charm beasts. Otherwise, it has as many features as the half-elf always gets. But, like many things DS, it's something unique that you don't get anywhere else.
So you decided to keep the spellcasting bard rather than try to create a replacement feature. Can't blame you...
Purely to preserve a 2nd Charisma-based casting option (otherwise, we're left with only the Warlock). The "Bard" as a separate poisoner class never really made sense. It's a rogue...who uses poison. Brilliant. But, argument was proposed earlier to do away with the Bard caster as a class in DS. If you're running a hardcore, old-school, true-to-canon setting, I'd say go for it.
Alternately, if you don't like the current psionic rules, it wouldn't take much doctoring to convert the Bard caster class into a homebrew Psion class. Many of its spells are focused on the mind anyways. Components would need to be addressed as one feature of the Psion is that everything comes from the mind. No components, no somatics, no verbals.