Look at the B-Link settings and check your Punch Control. It’s kinda weird with Castle cause it’s seems backward how they have it set up. You might want to try 0% which means you’re actually getting ALL the punch. You can do a motor test too and adjust the Torque Control which lets you fine tune torque even more. I think the stock settings on the
MMX8S have timing at 10. You can play with that too but I wouldn’t go above 12 or 13 cause the motor will heat up faster the more timing you put in. You can increase your Start Power too which is usually Low. If you use good batteries you can try Medium or even High to give an extra push at takeoff. Also calibrate your controller to make sure you get full throttle, reverse and the proper idle settings too. There’s a couple more things you can try but I’d do one or more of these first.