We here in the HBMRC club race the grp5 cars as a class
We run on wood tracks with a gloss finish
As a rule of thumb for us is swap the pod for the white slot-it pod as the sideways one has alot of flex
We mostly converrt them to sidewinder but if sticking with anglewinder the spanish king works really well
Also for short track the slot-it 21500 rpm is a really good motor to go for
Some of us here are using the tape trick and is of a good benefit