i would take it back to the shop and ask them to figure it out for you...

but if not, try putting the chain on the inner ring and see if that makes it better. if it does and you want to use the bigger ring, move it to the inside (provided that it will clear the chain stay). if you do that you'll need to get single stack chainring bolts (since they'll be holding onto one chainring instead of two). you might need to play around with spacers as well.