Hi Noel,
u are base in Surabaya, why dun u take time to visit Mr. Kolopaking Jr @ SIMANIS NURSERY, in lawan? or some well know nursery in Surabaya.
Take a look at what is avaliable and do well there and then, buy some ..... believe you will get more informations with the local.
As some adv given here are generaly more suitable for grower in the west.
(No offense to u gd folks here. Cause growing in tropic is so much different.)
Take example - A nursery in Bundung, Indonesia will plants some paph species such as praestan in rices hull. or in leaf humus for Paph mouqetteanum. But other area, pple may used charco and other method.
In Singapore - if u ask this questions for Paph, no one here can give u a gd answer- cause in SG pple generally prefer den, phal, vanda and others, than growing a paph. Cause the generally believe its a cool growing plants and its not suitable in SG. But its supposed to be a backyard orchid.
hence. it is always a gd idea to walk around nursery and chat with the friendly owners and they will share a lot of gd infor.
By the way, u should be able bloom alot of great var of paph species there efffortlessly