I've settled on 10 front and 7 rear, been running that for about a year with occasional attempts at 10 all round, 10/5, 7/5 and 15/10. And maybe some others :/
10/7 seems to be ok in most situations that i've come across (admittedly only carpet and astro so far). Heavier front seems to be the one "rule" that no-one breaks!
Don't actually think i've seen 15/5 on any of the team driver set ups (but then, i've not looked for a while!)
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