Why are my pseudobulbs never as plump and smooth as they are in the store?????

[astrid]

Hey guys!

You know those lovely, shiny, storebought orchids right? You see them and they have pseudobulbs so plump they look like they're about to burst like a water balloon, right?

Well why in the heck do my orchids' bulbs all get wrinkly when I take them home?
I water my oncidiums, brassia, and miltassia type orchids pretty regularly (I live in a 40-60% humidity climate with low light all winter and my room temperature is probably 65-75 degrees fahrenheit). I waver between weekly watering via soaking their pots for a couple hours, to watering every four days at most.

I think what I'm doing is great- one of my plants even is in spike now and everyone has new roots growing and shows overall great health.

But I just don't understand.
I feel like I'd rot my plants root systems off if I watered them more.

But somehow, the plants in the store have smooth, fat pseudobulbs, and my plants at home have pretty fat, yet wrinkly bulbs and it drives me crazy!!

What do you guys think?
Does the wrinklyness matter?
Do the nurseries have deals with ancient wizards to get such fat and juicy pseudobulbs?

I'm at a loss here.