what kind of motor heat sink do y'all recommend ? i switched out to the high speed pinion....hits thermal shut down fairly quick. im running 6s pack on punch 9 located in arizona where its hotter than hell everyday. Its my opinion that these arrmas are probably the best rtr models out there but as expensive as they are,should come stock with a heatsink...just saying...thnx in advance and have a great weekend ☠?