Other than the yihi chips not many boosters out there that hit 70w..
You can build breaks mod with the ptn04050 boost chip its rated for 4amps but it will easily do 10A 50 watts with 30A battery.
Its a great chip but does warm up when uber chain
vaping at 50w
You can build uber small with 4050. I made a car keyfob mod with a lipo that will do 40watts..
fasttech has the vamo v10 it will do 55w
Otherwise not much ado if ya find one pls post it.
Uber small have to use 18ga wiring for best results..