Spheres of Power (Mana)

[Ignicrios]

Question about the mana sphere. The expunge, manabond, and manipulation/amp only allow you to apply one effect at a time, is there any way to increase that amount? to say add two amps to the next spell etc.

appreciate any help and advice on the matter

[Battlechaser]

You could use the great amplification talent.

[SangoProduction]

There is the Spellshot Engineer archetype, which, if I recall correctly, lets you use multiple (amp) talents at once.
It's a surprisingly competent class. Especially for a gunslinger archetype.