Sensorless BLDC start problem

Hello everyone.

At first, I want to say thanks to the developers of this awesome ESC. I'm using it at my projects for a long time and it works almost perfect.

Now I'm trying to use vESC in my big hoverboat model. The motor is T-motor U8 135kv with 30" solid carbon propeller, it was previously used on large quadcopter and was presented to me without ESC.

My vESC is HW version 4.11 and SW version 3.38, mode is sensorless BLDC​. The problem is bad start with propeller attached to motor (without propeller it start good). ~30% of starts happens in reverse direction with weird commutation noises. With adding throttle speed of wrong rotation and noise increases. I was playing with settings for few hours and was unable to find good combination of parameters for good reliable start. Adding minimum duty cycle to maximum value of 10% raised a chance of good start a little.

I also tried to flash old 2.xx firmware and the newest one, but motor start looks always the same. 

Please, help me to find solution. Maybe I need to recompile FW with some unusual parameters of change some hardware for reliable start of this motor with large propeller?

Thank you!