Please advise in which mode do you run Komar: RPM control or voltage control mode? In the RPM control mode, besides the battery voltage, the maximum electrical speed is limited by m.max_eangvel.
If I got you right, the Overload counter is not increasing in your case. It means that it’s not the hardware limit.
If all of the above is fulfilled, the next step to increase the motor speed is to set field weakening mode as it described in the post.