I too live in Sothern Michigan and have had similar situations as well. I think alot of the problems you basically answered yourself, do too the unseasonable weather we've had too hunt in shorts at times as well as cover ourselves in mosquito repellant just too get that chance at getting that " Big One".
I've ended up with a pretty good year thou. Got a spike on the 6th of October, it was 78 degress that day, then a red fox came in on the 17th, was able to get him at 20 yds with my bow, then a doe on the 20th,and a pretty nice 6 pt on the 25th, then too top it off I ended up with a gobbler on the 2nd of Nov. soooooo...... all in all I think even thou we;ve had some pretty nasty weather " my year has been exceptional in my book". Hang in there plenty of time left to harvest "Ole Mossy Horns". Good Luck