Personnally I'd try and solve the wet hot pipe problem first.
Sorry to be ageuementative but this is illogcal - condesation forms on
cold surfaces not the hot (living in the UK we know this, we have a lot
of cold and wet)
Question are the pipes hoter or colder than the surrounding air?
You say the pipes/joints aren't leaking but bear in mind the water
pressure increases at night when all you CA's stop taking showers and
filling your pools.
Its not ant pee is it? Does it smell?
The hot water pipes should dry any moisture intouch or imediatley
A wild guess - is the insulations open cell foam possably with a non
porus outer skin (Like a sponge in a plastic bag) - when the pipes are
hot moisture on the pipes evaporates into the insulation, when the
pipes cool moisture is sucked out of the insulation and condensess on
You could always introduce air flow - dont no what it will do to your
thermal properties though.