ETB shed schedule?

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My ETB is right around 6 months old now and seems healthy and eats regularly on a 10 day schedule. I got it in the beginning of May and still haven't seen it shed. I am not sure how often they are supposed to shed but a month and a half seems too long. I see it's skin is getting very wrinkly and just feel like it should have happened by now. Temps are between 82-84 during the day and drop between 75-79 at night with the humidity rarely dipping below 80%. I have bowl full of moss and water along with newspapaer substrate and a large suspended water dish. I noticed some loose skin about a week ago by it's mouth so a placed a rock in there. It's coloration got dull last week and returned to normal but still nothing. Based on the 6 week time period, is it time for me to take more steps to aid the shed, or do I just need to be patient? Any help would be fantastic!