The decision to use TTN removes most of it from your control, since both the gateway transmit power, and (if you use ADR, which you probably should) node transmit power are commanded by the network.
You can of course rig things to output less power than commanded if you feel that’s appopriate.
Mostly though you’re left with duty cycle. IIRC the regs you face may be written more in terms of packet duration limit, which does place a fairly short limit on what you can do at SF10 (and make anything slower unusuable) compared to the very long and slow packets that European TTN users are used to.