Ghalleon: The feats you mention don't raise caster level, they raise DC, and the last feat you pasted specifically says so
Try raising caster level with stuff for abjuration or dispell only.
I've been trying to raisse caster level for abjuration for fun to boost the spellresistance spell, and you might consider having a look at these options:
class features:
wizard: domain specialist [abjuration] (from UA) +1
purification domain (for arcane users via ACF at level 5 from CC) +1
trait:
spellgifted (from UA) +1
feats:
arcane thesis (from PHB2) +2
protective ward [reserve] (from CC) +1
mystic backlash [reserve] (from CM) +1
magic disruption [reserve] (from CM) +1
Spell Thematics (from PG to Faerun) +1
Elven Spell Lore (PHB2) +1
spells:
create magic tatoo (SC) +1
For a domain specialist [abjuration] with domain granted power ACF [purification] 5.th and [protection] 10.th and the listed feats/traits, that would be:
+11 to dispel caster level check
I know there are a lot of other ways to get higher caster levels for abjuration, but these are the only ones that have been relevant for me. I look forward to seeing what else might turn up

I havn't even looked at magic items