In the meantime, an unscientific way to determine if you have tree clearance:
Get a helper to observe, and a short length of pipe, plus an inclinometer (also known as an angle finder).
Use the pipe as you would use the sight on a rifle, and aim in the general direction that your dish is pointing, but perfectly horizontal. Confirm that by reading either 0 or 90 (depends on how the angle finder is placed) and that will be your 0 degree
elevation. If it is 0, raise the pipe so that it reads 8 degrees. If you started at 90 for zero, raise until the angle finder is at 82.
Have your helper confirm these numbers while you look down the center of the pipe. Look off to the side left or right as you blink your eyes and see if there are any trees or other obstructions above the center of the pipe.
My impression by your pictures is that you are probably 2 or 3 degrees ABOVE the tree line and should have no problems.
One other thing; when the dish is turned upside down, you have to do some fast math that accounts for the typical 22 degree elevation TWICE, and the angle above the horizon itself. At due south in Fergus Falls, we are looking at a satellite elevation angle of about 36 degrees above the horizon. This translates to an true elevation angle of almost 60 degrees on the dish.
The quickest way that I found Hispasat was to find 97 West at whatever angle that it was at, drop the dish from 36 degree elevation to 7-8 degree elevation, and pan to the ESE. Remember at due south the LNBF should be pointing to your zero skew reference. For Hispasat, it needs to be rotated clockwise about 45 degrees..to the 7:30 position for the F connector, if you started at 6:00, as viewed from the front of the dish. Similar logic applies to your original P9 comparison, although I am not certain what you might be receiving on the Ku band side of 58 West with a 10750 MHz local oscillator type LNBF. There are signals using a universal (9750, 10600), using the 9750 setting. Make sure that you have a 10750 MHz LO type LNBF in use...which would pick up both Shaw Direct/Star Choice as well as FTA from 97 West. If it works for either, you're OK.