The low brighness when cold is not due to low PS voltages or current,
it is due to the fact that it takes time for the gas to get it up
completely. It may be possible to overshoot the target current/power
when first started to accelerate the process but this is very likely
to decrease the overall life of the CFLs.

Newr units do seem to perform better in that respect, but short of
replacing things with newer versions I think you will just have to be
patient.

J