It is a guessing game with us as well.
About the time you buy a full season corn you don"t get a chance to plant early and then you get an early frost and have junk for corn.
Add a few days to your maturity for next year and see how you get along.
What did you do last year. Did it work? Might just be an odd weather year this year.
Besides we don"t know how far north you are?
I plant 107 to 115 day corn here in east central Iowa.