Yup as straight as you can get it or it pinches the pins.
Not familiar with your tow bar but with my blue ox tow bar it had to be really straight to get the pins out.
Here are 3 things I learned along the way of towing a toad and getting it unhitched in difficult situations. I do not use the clips I use hitch pins that can get stuck if you are not 'perfectly' parked straight with the toad.
1. Silicone the heck out of the pin regularly. This makes a huge difference in getting them to come out easily.
2. If you turn the wheel all the way one way after parked it releases some of the tension enough to get that side pin out that might be pinched.
(Fellow camper taught me that tip after seeing me cursing while trying to unhook my toad.):C
I carry a long small sized extension socket and small hammer under the front seat of the toad. Fits right in to gently tap a hitch pin out.