Altitude jetting

Just purchased a DRZ400S 2006, 800 miles. Its has an FMF pipe and stock stock header I believe. Purchased the bike in Seattle used. I live in the Cascades at about 2k feet altitude. Riding area will be between 2k-4k but sometimes up to 7k. Currently it does backfire some.

What would be the best jetting (Mikuni) for my riding and setup? I plan on doing the airbox mod.

Do all the mods, then ride it. Backfiring on decel is different than hesitation while on the gas or at WOT.

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