Weight is not a major issue in monos. I ran a HK Osprey (43") with 5 kg of batteries in it for offshore endurance. Testing showed that top speed was not affected by the extra weight. In rough water it will be more stable. It is more important to get the boats balance (CG etc) right. The motor etc you have will work ok I think. If you were going to buy a motor I would suggest around 600-650 kv and run 12s. Higher voltage gives you lower current draw and temps, but start with what you have.
In the Osprey I ran a TP 4070 440 kv on 12s and a Prather 240 detongued, it was set up for endurance running so top speed was only around 70 kph but I could run for 20 min on 20,000 mah packs. It was only pulling 55-60A.
On 6s 2P you can get a reasonable run time, you will have to test and check temps, power used etc. I would suggest to start with set the lvc at the highest voltage and adjust down when you know how much you are drawing out of the battery packs. This will save you bruning up packs.
NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
2016 SUHA Q Sport Hydro Hi Points Champion.
BOPMPBC Open Mono, Open Electric Champion.
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