Two spells you should be using to help your enchantment spells land are
Crushing Despair, and Mindfog
Mindfog works well with discoballs, and should always be cast as a pair, it reduces will saves by 10.
Crushing Despair works well just before you cast a mass hold and has a temporary effect (no save) to reduce will save to enchantment spells by 4.
Also you might want to look into Yugo Pots. Spellsinger Songs will also raise your DCs by 1, +2 int ship buff, +7 robe/docent from echrono, and either a dreamspitter or one of those trinkets that summons beholders
All of these put together should get your DCs to 45, and with crushing despair it will be an effective 49.
That is a very impressive DC for a first life human caster.