well i just ran a full flight power 5000mah 5S pack through my hyper st with a 1515 1.5d (2700kv) 52spur / 11t pinion
mamba max with 25mm fan , no other mods
9 mins runtime and 60 deg C motor , and esc , batts about 40deg C
im pretty sure if the 1515 1y is geared correctly a MM , MMM or mgm 16018 will handle it fine