Gary,
I use a similar approach regularly on the Teme....I will bait up to 6 swims with a dropper or two of hemp/maggots and if I can wait, re-bait all 6 again before I set up a rod before I then literally drop into each swim in turn until I catch. If swim 1 fails to turn up a fish within 10 minutes or so, I drop another dropper or 2 in and move onto swim 2 and repeat the dose....
....I have been through the 6 swim cycle completely before catching on the 2nd lap.
The secret of the approach to me is if no fish are forthcoming in a swim it makes sense that no feeding fish are present and therefore they should be feeding in one of the other baited spots. For me the lack of bites equals anticipation and confidence that I'm getting closer to a take each time I move into a fresh swim....be advised though, if you can leave the spots for sometime, re-baiting regularly before actually fishing, the action can be instant!!
Difficult though it seems, I will re-bait and leave a swim after catching from it to try to minimise the disturbance....I feel that this gives me a chance of further success later in the cycle in that same swim.
Cheers
Paul