Abondon the take-off, if possible with the words ..."Stopping"...."Something's wrong" even "Something's wrong with the balance" or "Something's wrong with the trim".
I wrote that as soon as I'd read your post. ie I did'nt spend ages mulling it over. Now I'll justify it. (or not !)
YOU are flying the aeroplane, HE is supposed to be caring for your safety, but in this case he won't be aware of a problem. There is'nt time to explain, so do the safe thing. Stop ! How could you continue with a problem, not knowing the cause ?
In other situations where you both were aware of a problem, he , as instructor and, therefore, pilot-in-command would decide upon the actions to be taken. This might involve you in simply handling the flying whilst he carried out drills, it might not. He would have briefed you before flight and variations on this may have been briefed.
The biggest mistake of all was to continue with an instructor you did'nt get along with. Have a meeting, discuss and resolve the problem, or find another instructor.
As for CRM, or specifically the so called "training" of CRM I've recieved, there's been absolutely ZERO instruction on pilot-to-pilot interaction, how to behave towards colleagues in the flight deck, how to avoid unnecessary disagreements. ALL of the emphasis was on how difficult the cabin crew's job is in an emergency, pilot to cabin crew emergency briefings and why a monkey's backside is bright red. Pathetic. Never mind, it's another few ticks in another few boxes for the CAA to coo over.