Given the wattage and subsequent current draws, I believe the 3674 is too low (1000/1500 watts, 69/104 amps - not enough torque) and the 4082 a bit too "large" (2000/3500 watts, 108/189 amps - probably more than enough torque but needing a huge esc and not getting good run times) If I am mistaken - let me know...Given the 4074 ( 1500/2000 watts, 81/108 amps)as the motor of choice (or an equivalent if you have one)....
The 4074 motor is too small for the Titan 40 hull. I'd not use a smaller motor than the 4082, there is apparently a misunderstanding of motor specs. The 4082 specs are not what the motor will draw, but what it can safely handle. You don't have to load the motor to those specs. Trying to get 50+ mph from the 4074 motor will lead to disappointment due to inadequate torque and inadequate motor mass to handle the heat. On 5S you will be pulling at least 135 amps to go 50+ mph, and amp spikes will be higher.
If you want both speed and run time, I'd go with 6S and either the 4082 or 4092 motors with a Kv around 1200 to 1400. You will get much more run time than with 4S at the same speed, things will run cooler and you will have the option for a few 'SAW runs' if you ever want to. Believe me, the extra weight of 6S is nothing to the Titan. In rough water I add up to one pound of lead to mine, and all that does is help keep it on the water - speed remains the same.
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