I grow my pings in either pure spag, dried spag/basalt (any ratio) and peat/sand, humidity of 70% and up, filtered light and temps from 8c-40c, but I only grow tropical pings, I tried a few temperate (prims and vulg's) but they were not happy.
I use 15cm tall pots and have a 5cm water tray in summer then a 2cm tray in winter.
My understanding is that they like it humid but generally the plant itself (leaves/crown) wants to be dry, although in saying that I have flooded my rectifolia (accidentally) a couple times and it didn't seem fazed.
They also seem to flower at random for me, in both summer and winter, wet or dry, high to lower humidity (70-100%), and they massacre gnats and moth.