I had a feeling it would "hiccup" a bit with the 55...soooo, throw the 52 back in, and put in the 170 main...do a couple plug chops just to be sure it's not too lean...but I'm thinking it'll be good/safe...and enjoy!
I never run the vents on the air box "open"....I find running them open just dirties up the air filter very fast!