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I'd wait until your ability requires the change - you'll know it and it will give you another reference point vs solving a problem that hasn't developed yet.
You can always add them later. I also would keep the stock tires until you need to go R-Comp or close (MPSC tires)
There will be lots of opinions on the subject. Everyone is different and has different budget levels. I just prefer to experience the problems first and then add the solution/modification versus adding modifications to soon
Good luck!
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