dave i tend to release the pressure on the pump to let water come out from moisture trap every 15 pumps or so to make sure, this not a requirement but i tend to do it to make sure after hearing the same thing you did.i to have only used a pump form start of owning a pcp and have no experience of divers bottle setups. although nearly bought a setup to day but decided not to as i did not know what to look for.the only thing i do with my guns other than wipe them down is grease the loading bolt on the action itself with a small amount of moly grease for lube. my attitude is if it aint broke don't touch it. lol
chris
p.s. also change bolt seal once power starts to drop but anything else it goes to gunshop for a look at.don't know enough about the workings to mess with them, but the other guys on here will give you better advice than i can m8.