You want a final drive (straight length dependant) of 3.5 -4.5, you can go lower but normally on flowing outdoor tracks.
Also what motor do you have as some respond well with high end bell timing, I use a FDR of 4.2 on my local track 25m straight with 35* EBT on a G force motor with 40mm Orca fan and it comes off after 5 mins at 60* ish depending on layout.
FDR is spur /pinion * internal ratio (not sure on 414)
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