Hello,
One of the things that seems to be left out on a regular basis when talking about electrics is the prop being used, how the ESC is set, and the desired RPM. I have used an Eflite 25 on a 54 oz model and it could fly the sequence; however, it was probably not the best set-up. Knowing what I know now, I probably would have set it up differently and it would probably be just fine.
At any rate, I use the same simple Hubin timers; however, I only use them as an on-off switch for the power system. I just set the start delay and duration while adjusting the throttle signal to 100%. I spend my time programing the ESC which for a CC is basically setting it up to run in governor mode (motor Kv, battery voltage, gear ratio), adjusting the gain, power ramp up and setting the PMW frequency (the switching frequency, I believe I use 12). For the CC, if you set the over current limit to very sensitive it will generally shutoff the motor in case of a prop strike. It will not re-start even if the prop is free to spin again. It is a useful feature.
If you are using the version of the motor with a Kv of 870, assuming an operating voltage of 3.7 volts, the motor can only generate a peak RPM of about 12,876 (870 x 3.7 x 4) under load. If you are asking for 11,000 RPM, you may not have enough overhead (meaning the difference between the 12,876 and 11,000) for the ESC to govern the motor properly. The max permissible RPM is probably closer to 10,300 (~80% of the 12.876K). That might be one of the reasons why the power system seems to behave oddly.
I would be curious to know what prop you are using and my suggestion would be to increase the cell count to 5S. Choosing the right prop is also important; APCs are OK but there are better options out there (I use a lot of Xoars). The model that I mentioned earlier ended up with a Brodak 12x5 prop (no longer made). Although the prop was supposed to have a 5" pitch, given the deep airfoil it used it behaved more like a 6" or even 7" pitched prop. Badass props are worth a look as well. Light props and spinners will make it easier to govern the motor RPM as well.
Finally. the voltage limit on motor is more a function of the RPM limit before the magnets fly off. The current limit is probably closer to being an actual limit.
Good luck