That motor doesn't draw a max current of 127A. 127A is the just the most the manufacturer thinks you can run though it with good cooling without burning it up.
It might sound similar, but there is a big difference, any motor is capable of pulling WAY more than its rated current, for a motor that size I would guess it can pull somewhere in the region of 500A, it wont pull it for long as it will burn up quickly, and it won't run efficiently while doing it, but if you overprop it and the battery can supply it, it will pull it.
With a run time of 1:45 assuming you are leaving a little in your packs I will call that 2 mins, or 1/30th of an hour, 5Ah x 30 = 150, so you are already pulling an average of about 150A, which is closer to the limits of both your motor and ESC than I like to run.
If you want to increase KV you will need to reduce your prop load to keep the amp draw in check, or drastically reduce the run time so things don't have a chance to get up to temperature, and I am talking about more like 10 seconds than 1:15.
On my dataloggs I typically see fairly long peaks under acceleration out of a turn that are about 50% more than the average current and hole shots are about double the average current so you are very likely already well into a negative buffer zone.
You won't see much speed increase going from 2200kv to 2600kv with similarly rated electrics unless you are willing to change driving styles too. I would recommend you save your money, and spend your time fine tuning the boat and tweaking your current prop.
Paul Upton-Taylor, Greased Weasel Racing.
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