If you want the RPM spellslingers to be powerful in Dungeon Fantasy style combat, why would you want to eliminate conditional rituals? With those, a character can prepare several powerful spells in advance, waiting only to be triggered. This is not dissimilar from D&D style Vancian magic. And, since the energy accumulation is all done well in advance, this can allow a caster to basically cast a spell per turn. Not bad. You can also consider allowing some advantages like
Mana Sponge--its 135 point version allows Mana Reserve to regenerate at 10 MR/second. That's roll-free mana to power spells!