No, the small gain of a high current charge compared with a normal like 2C charge can only bet noticed if you can run a heat/final flawless, one mistake and the gain is gone. The difference between 30 and 40A will be much smaller. It is also depending the battery, if you use 4200mAh shorties or 8500mAh normal size packs.

I'm using 2s lipo stick with 6300 mAh.