Deathless

I'm working on a 2 stage RS (2190's + 2850's) on 3s, with a 2850(honey badger) as the pusher. I will be using a rocker switch to switch between full rof (14dps), and dropped rof (8-9dps). By my calculations, I need to to drop the voltage by 2-2.5v. The only info I could find was to use 1N5400 3A diodes that drop the voltage 0.7V each (so that I would need to use 3 in series).

Now my question is; are 3A diodes going to be safe to use with my particular setup? (I estimate my motors at full stall to be in the neighborhood of 75A). If not, what would be a better diode to serve my application? Perhaps there is something else I should be using.

Any help, suggestions or clarification would be much appreciated as my knowledge of circuitry is quite basic.

I'm working on a commission for a friend and they were a little specific as to what they wanted. They requested a performance upgrade above stock (range/fps/dps). However They do not want to have to use any specialty batteries/charger as they will only be using the blaster occasionally as a cosplay prop.
I was thinking about just using a AA battery tray, either 6 or 8 cell(alkaline) to increase the voltage. Now I was wondering if this specific power source requires removal of the thermistor, removal of the motor pcb or motor rewire. I was just hoping to use the stock wiring in the rest of the blaster (apart from removal of the locks).

I'm somewhat new to internal modding of nerf flywheel blasters so any constructive advice would be greatly appreciated.