I'm a big fan of Mr O inserts, between the options there is always a 'right one' and they're very reasonably priced.
Most often now I'm on a 45mm blue/medium rear insert and a firm/firm chubby on the front depending on grip levels. I'm still learning with this but in 4wd I use a firm on grass but a firm chubby on astro. The reason being I think I can feel the steering more with the stiffer tyre, like you can do with a 2wd front tyre say. Grip is rarely an issue on astro so if there is any loss of sidebite I don't really mind.
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