First build blues. Help appreciated

Tested my first build earlier today and it seems to reach max rpm around 15-20% throttle (as shown on my maytech remote). No further increase in rpm at the prop is seen from 20 to 100%. I have the same issue when running on battery or using my charger in bench/power mode. I’m running a sequre 14200 pro ESC.

Any ideas what the problem could be? It’s like it’s got an rpm limit on it . Has my ESC been set up wrong perhaps and if so, what do I need to change in BLheli?

My other thought is… is it possible I have a bad solder/connection on one of the 3 cable wires (from esc to motor)? It’s running smoothly but with barely any RPMs so I’m not sure it’s a bad connection? Would it run at all with just 2 of the phase wires.

Any thoughts appreciated

Unloaded in air or in water?

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Needs to be underwater/ under load to get any rpm control with normal esc settings.