I have ALL resis on my peak route. I pick up my helper on my way to my 1st stop. When I get to the stop, I have 2 totes that I fill with my 1st bunch of stops. I can push those into the cab while the helper is walking a driveway and I can massage the load a bit better.
Once I am done with section 4, I am done with the totes. I keep them handy for the stops that have 6+ bags of whatever. Then I toss them all into a tote for the helper to carry. If I find those stops on the shelf, I toss them into a tote and but the tote on the floor under the section.
As I finish a section, I start sliding the next section forward and get everything in HIN order. If there is room, I put the floor packages on the shelf. Last week, sections 5-8 completely filled the shelves when I slid them forward and I still had the floor filled under sections 2 and 4 up to the wheel wells. EVERYTHING I put on the floor is in HIN under. Way easier to find that way.
I would guess that over the course of a day, my helper is waiting for me to get to the driver's seat about 15 minutes. Sometimes, it is faster to finish sorting, then to drive off and have the pile fall on the floor. Earlier in the week, I was 2ish hours over, Thursday, I was +.3 and I would bet that I was close to that on Friday.
Do not be afraid to take a break and walk away for 5-10 minutes. Sometimes, that is your best play.