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Definitely go just one step at a time 17 to 18, etc.
Yep, I bumped up to an 18 tooth 10K miles ago and never looked back. Thought a few times about a 19 but I think it's too hilly around here to find that a comfortable fit. And, yes, I do look for 6th once in a while out on the interstate...but not often. 
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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