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When you say bathing cycle, are you referring to heating cycle or running the spa with both pumps running on high speed? For the moment, I'll assume the latter is the case:
Although your breaker contains a GFCI, it also functions as an overload mechanism. But unless you know all of the exact circumstances it can be quite difficult to determine why it's tripping, either a ground fault, or a fully qualified overload.
What I do, is watch and wait for this thing to trip. At the moment it does, (within 2-3 minutes), I put my hand on the face of the breaker to feel it's temperature. If it's warm, then it was caused by an overload. If not, then it's more likely a ground fault.
The fact that your main pump just makes noise on low speed leads me to believe that your pump motor may have a big problem, (causing the breaker to overload and trip offline), and need to be replaced.
There are other important questions that need to be considered,
1. Is this a new spa installation?
2. How old is the system?
3. Was it working ok, previously in this installation?
Also, now that you've had what seems to be some overload tripping, I would also open the breaker panel and examine the wiring connections to the breaker itself, to be sure they aren't discolored (oxidized), and that the screws that hold those wires in the panel are VERY tight. To let this go, opens you up to the possibility that later on, that expensive GFCI will burn itself out.
Matter of fact, this entire situation with your GFCI breaker tripping may not be caused by the spa at all! Considering you're running both pumps and heater and then it trips... well, I'd definitely take a look at the connections on the breaker itself.
Temperature of the breaker, will tell you everything in this instance.
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