Xnyong, again, speaks datrufe (the real truth in this case). I've skipped many a shower by being obviously freshly showered. Shower time doesn't have to take away from pops as I've had a few in the shower too, and that was back before I always paid for plus.
I'd also like to add two more cents on seeing any k-girls from the aforementioned agencies...
More often than not, I go for one big pop. It really all depends on tact and what you push for. Most of the k-girls I've seen lately for the first time (and I always go for plus) try to get me to pop via BBBJ early on and I stop them. If you come across as a nice guy and let them know you're confident you can pop twice in an hour without totally wearing them out, it shouldn't be a problem. Yes, YMMV, but it helps to have a good rep with these agencies. I have a bit of a rep for being nice and that's how the bookers remember me. I imagine very little is usually communicated to the girl at booking, but if they're freely told anything positive about you, you might find yourself in a very good situation when you walk in the door. Then I make sure the girls remember me because I give them something unique to remember associated with kindness (I've never tipped a k-girl extra cash for those thinking this is what I mean).
Be polite and respectful when speaking to the bookers, even offer to leave solid reviews on newer girls to help them out, and be the perfect client. Do the same with the girls only add on a BFE and show them maybe you care. It might seem like too much work, but it's all about the prep. Once the groundwork is laid, all you have to do is maintain it. There's nothing like having a mind blowing experience that follows no real routine and requiring no prompting. Whether it's spontaneity, solid GFE, borderline PSE, or MSOGs, how the agency and girl feels about you does mean something. Even board presence can make a difference if they recognize your handle.
I do wish I wasn't too lazy to learn Korean. That could really come in handy on adding to the fun.