I would stick with the B4 and as long as it's setup properly you should be fine. If you post your current setup I'm sure we can help refine it to suit your tracks/driving.
Something that should make the car easier to drive (especially on slippery tracks) is getting the AS7487 rear suspension blocks as that will let you increase the rear tow in in 0.5 degree increments which will increase the amount of rear end grip. (3 degrees is standard, try the 3.5 first)
Can't comment on your speedo/motor combo as I've never used sensorless in 10th.
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