The 410 is quite light at the back, front tyres do take a pounding.
Bit of weight at the back should even it up a bit. Think I have every weight available in the back of mine! Side rail, under diff and skid plate.
As for oils, something like 10f/7r, 7f/5r wouldn't be a million miles out.
The twin slipper helps massively, but isn't cheap!
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