Reverse respond to your example.
Wiz 3 / Psion 3 / Cerebremancer 10
+ recharge too, is quite enough really.
Psiomancer feat would give almost the
full Wiz 13 spells, just enough leftover
to do a recharge.
Cerebremetamagic would then allow
each of those spells to be metamagic'd
up to the Wiz13/Psi13 capacity, although
it's multiple recharges and ditching most
of the psi-festing for the metamagic.
Then of course recharge again, and a
Psiotheurgist is kinda meh in comparison.
It can't pay for the massively higher CLs
and so many spells are capped anyway.
**
The T.O. link
iirc (I should review it more)
Cleric goes DMM Heighten first
raw Ardent 2+ then goes Psiotheurgist.
Having gotten 9s on both sides, now
you Cerebremetamagic it to cheese^2.
Moment to moment its very thin compared
to the Wiz/Psi above, it was just the furthest
reaches I got to at that time.
I was assuming the DMM Heighten tags
the ridiculousness right off the bat.
(it is possible to
not break dmm heighten ...
)