is there anything i need to look for, or do, that will help it idle more smoothly?
Long-distance diagnosis, but . . . assuming the prep included carburetor cleaning, you can perhaps improve idle stability by adjusting the FUEL SCREW.
To adjust, remove tamper-resistant plug (underside of carb, engine side) by drilling hole and "picking" out the plug; bottom fuel screw LIGHTLY (with small flat-blade screwdriver), then back fuel screw out about 1.75 or so turns, good starting point for a stock engine.
This adjustment should fuel-enrich your idle mixture; conventional wisdom has KLR650's factory-set fuel-lean initially, in fear of emissions violations.
Otherwise, with clean pilot circuit, clean air filter, at about 1200 rpm, should idle reasonalbly smoothly.
For a good primer on your carburetor, click here:
P.S. FORGET ABOUT your fuel mileage! You're doing fine!