Harley.

Just because the motor current is more than the ESC dosen't mean you can't use one with the other. The spec's of each one is for you to know how much they can handle with out danger of damage. You always going to go with the device that have the lowest constant current (lipo or esc or motor). Only draw is that if you let a big diference on constant current between each other you will not be able to use the full capacity of the other 2 parts.

In your case 35A is not to much diference to 45A, so the 35 ESC will be ok but you will have to keep an eye on the throttle so you don't over amp the ESC or the Lipo. If you want full power for 3D the 45A or plus will be a better choice as long as the lipo can handel it also. For example if your lipo can't handel more than 35A there is no need for a 45A ESC. It's all about balancing the whole system. A wattmeter will help you find out how much you can get from your setup.


Fernando