It is a very nice place you have there! 
With my GNSS eyes, I see vegetation in one direction and a building in another. If the other two sides are similar, then your test area looks quite good. There are only a small amount of obstructions and they are very low on the horizon.
If you can share your log files from a test, please do. Include the raw log, the base corrections, and the solution file please.
If you do not wish to share your log files, then maybe you could analyze or present them in a similar way to this: reach-bouncing-rtk-float-to-fix-on-tractor