Ok some setting suggestions
Base set to static, Tractor rover should be to kinematic. Kinematic will help on the tractor because the filter will assume you are moving on a path increasing the accuracy of the path.
Mask; I would set the mask to 12 degrees, if your under trees it will still be able to squeak out a position, this will be the same on base and rover. The emlid will only use the best satellites for the solution anyway, the rest it just tracks until they become the best to use. Its only using 3 to 6 to compute a position.
If you are taking the base with you and distance is not an issue "Within the section, 640acres " to the tractor try a higher data rate. Somewhere around 19200baud, the emlid lora values are a little lower than the normal 232 baud values. I always leave radio power cranked no RF emission rules apply at 0.1w in my area , frequency is whatever works best for you.
The faster you can pump the correction in the faster it can be used to compute a solution.
You only need to send the corrections that the rover is using for a solution. In your current state Beidou would not be needed.
But I suggest using all constellations, except QZSS in north America. Reason being if you loose fix at the tractor the computed position off the Emlid is better than WAAS accuracy.
Here is a field harrowed using an m2 all constellations active and no rtk corrections, still very straight.
I am not sure what Hz your light bar program requires, but you wont be able to react faster than 1hz steering by hand anyway. With automated guidance the fastest it can handle 5 or 10hz is beneficial, it allows the errors between readings to be smaller and requiring smaller steering movements.
All subsequent settings off, perfect no use chewing up processor power on stuff that you are not using at all. This will also lower power requirements, and module heat creation.
For your base coordinates, if you do have a good spot to put the base year after year, survey in for the maximum time. Once the reach has coordinates, find the drop down that locks those to manual. Write down the coordinates for future use. As long as the same coordinates are used for that exact spot are used, your passes will be the repeatable year after year.
Your passes will be completely accurate relative to themselves and repeatable, though the position may no be absolutely precise to the survey. Absolute Positional accuracy is not required for farming, and requires PPP, or other survey methods to accomplish.