Morning Les. I've recently switched to Motion Horizontal. Just like in the good old days of Powerstroke, I've spent quite a few hours getting to where I can play a decent game on Pro. Here are my thoughts and settings, I hope they will be a help.
1) In Windows/control panel/mouse/pointer options: Turn off pointer enhancement. I'm set on 4 marks from the left.
2) I use a Razer Taipan mouse, which has adjustable dpi on both axes. I'm set on 200/200.
3) In game sensitivity is set at 2.00/2.00. Remember that in game,the lower the figure, the faster the cursor movement, the opposite of Windows and mouse sensitivity.
One thing I have noticed which can cause problems is that in practice mode, where you get post shot statistics, I've hit a shot at 100%, 0 offset, On plane at a perfect .25 tempo but the ball carried 40 yards short of what I expected. I believe that it's possible to have a swing that is inside the 3 second rule, is perfect in every way but is too slow overall, which drastically lowers the carry distance. When I helped a mate via Skype/TeamViewer on my settings his swing was way too slow and I had to move the Windows mouse sensitivity one click to the right of where I am i.e. 5 clicks from the left. He has Win 10 and the same mouse as me but the cursor speed was completely different. I have a second button set up for general use to move the cursor for everything else except swinging which is set at 2000/2000. I hope this helps mate, good luck.
With your settings of 1200 dpi and 1.00 in game, my swing would be so fast that it would be impossible to hit the ball! lol
P.S After a recent Windows update, the pointer enhancement was turned back on, so try to remember to check this before you play.