Ok, this is the LAST time I will post about THIS!
I finally bought the flights, AND we are staying the extra day!! Our final dates are now 4/21 - 4/28. Our big plan (thanks to DBF) is to avoid the parks at all costs on the weekends!! HA. So now I have to re-do a couple ADRs and re-plan which parks, which days, but in theory it will look like this
Sat 4/21 - arrive: Resort day
Sun 4/22 - Maybe DTD, explore a different resort?
Mon 4/23 - park day
Tues 4/24 - park day
Weds 4/25 - off day
Thurs 4/26 - park day
Fri 4/27 - park day
Sat 4/28 - Resort day: leave
When we went in October we stayed 7 nights, and it was a little too long for my DBF (he has a prosthetic leg and got a blister towards the end), so we are banking on the rest days in the middle helping with that.
Excited to have a semi-final plan.

Thanks for everyone's input!!