You should be ok still at 1500 feet, but you may want to drop the main jet one size if you go up past that. You may also raise your needle clip one notch and adjust the air screw. You may or may not want to drop the pilot one size too, if it runs a little sluggish on the bottom end, then drop the pilot too.
__________________
Yours truly, sincerelly, love always, Josh aka The DirtDemon.