What sort of Capacitors are you using?
I've been running all sorts of brushed stuff for years and never had a capacitor explode.
Currently, my brushed speedo is a Mtronics Sprint 12 turn limit so older version of yours and I'm using a 16v 2200uf cap from Maplins with no issues racing the pants off it with a 20t Saturn motor and lipo cells. Final drive ratio about 7.2 to 7.4
I run a 12turn checkpoint in a 4wd with ratio 10.8
Kit std Avante is ratio 8.33 with 20t pinion, so for a 17 turn motor i'd say 20t should be ok.
Any chance of a picture of your complete wiring?
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