I believe it's not only your technique/approach in buffing off the LSP. That's simple, and can be quickly learned/rectified.
When you have the luxury of ample time, it's a pleasure to buff-off and enjoy the great looks.
But when you hv to rush, it's a pressure, and you might miss certain areas.
Time Management/Time pressure
When you're dealing with another company, you're normally at their mercy when it comes to time. Perhaps they'll be calling you endlessly to "chase" you? Don't let them push you. If you're experiencing time pressure, perhaps you can look into how to reduce any rushing (timing, process, manpower mgmt etc). I always allocate minimum 15mins to park out in the open, and check each area before even calling them to tell them its ready.
Bring a kit with you.
Always bring along some dry MFs, damp cloths, detailing spray and brushes (in a small bag) for on-site touchups if necessary. I have always have 2 kits ready for my staff to use. When you reach that place, and before your contact person comes out, quickly go around the car again and re-check. You could hv missed out some areas, or there could be some splatter near the bottom of the car. 20miles is not a short distance and u won't know what u'll run into while you're on-route (puddles, etc)
Drive slow + Plan your route
Drive as slow as you can without inconveniencing anyone, and look far ahead to minimise hard braking. It's horrible when you reach your destination, and you hv to re-clean loads of brake dust from the rims.
Depending on which country/region/city you live, the weather also determines when you can drive the car to your destination.
