I didn't get idiot proof answers for my newbee question here.
But for sure I'm learning a lot of very interesting things about Storm mods and hard to discover wicked parts!
And since 5700KV doesn't like 3S Lipos, I just grabbed a secondhand Mamba Max 4600KV from eBay for future tests.
The seller has another one, maybe worth the chance.
Starts at $29.99 and buy it now is $39.99.
A fiver for shipping in the US.