Florida, I am very much in favor of pollen trapping, and have been doing so for several years. As such my authority in the matter is limited, but I will tell you what I have found workable. Those with more years in this activity may well be able to provide superior information.
I have used the front porch plastic traps, wooden front porch traps and the sundance top and bottom traps. I will be setting up 20 new hives next week and they all will be 8 frame sundance traps.
Early on I placed traps on strong hives in mid to late summer, and I had the same issues as you. Requiring huge numbers of bees to learn a complex entrance pattern was difficult for the bees and anxiety generating for one new to trapping. More times than not I would loose my nerve and remove the trap, however on the several I just closed my eyes to the congestion, things worked out fine.
Now-a-days I only place traps on new splits and hives coming out of winter. On the new splits with a new queen installed, the hive is producing a reasonable amount of pollen in 8 to 12 days.
One significant disadvantage to trapping is the requeening issue. With a trap on the hive will have difficulty generating a new queen. Close frequent inspection to acertain the status and productivity of the queen is important issue.
I hope this has been of help. Hopefully other pollen trappers will chime in, as I would like to learn from them.