Over9000
3rd Shift Ass. Manager @ 2nd-Hand Adult Toy Store
I think the near vertical angle on the solar panels will help to maximize your critical winter production.
In my area, I roughly use a 3X height of object for shadow length on the shortest day of the year so your calculations look OK to me.
I was just looking at this from another perspective. If I can adjust the tilt from 85deg more towards 0 (or in between) during the late spring / summer months, I have way less shadow.
Check it:
