I am planning on something similar. I can not readily identify various clover species. I overseeded balansa in some areas and did not notice much growth of the balansa or even identify it. Was still getting frost warnings in June. Maybe it was the turkeys. I did have some grow in one new plot that was planted with oats. Both are similar height, about 2 feet. That was planted 5/3/19. For whatever reason, this plot, no soil test, lime or fertilizer did very well, in my opinion. It may have been the oats. They (oats) have grown well in different areas.
I am planning on planting balansa in separate areas to avoid other clovers and help with the identification. I will attempt to establish balansa ans let it reseed. Here is some info.
Northern Region
FIXatioN is ideal for pasture since it is a re-seeding annual clover. Fall sown FIXatioN will grow rapidly during the spring flush of cool-season grasses. As the growth rate of the cool-season grasses diminish, so will that of FIXatioN. If re-seeding is desired, livestock should be removed in June and the clover should be allowed to flower. The clover will then die off prior to the stressful summer period, releasing nitrogen for your grass. As an added benefit, the grass roots can follow the channels created by the decaying clover tap roots, allowing them access to moisture that otherwise would be unavailable. In the fall, when conditions are optimal, the seed produced will germinate and the cycle will begin again. It is important to note that it may be necessary to re-seed if flower production is lacking.
I will plant balansa with oats as the oats may have helped as a nurse crop. I like the natural die off and nitrogen release without having to till it under. So my current plan, always subject to change, is to include some winfred in the mix. Winfred is supposed to be multi-graze. A big test will be in the spring as the oats and winfred will be gone. I do not want bare ground. So the balansa regrowth will be highly desirable. Balansa is supposed to be very cold tolerant. Hopefully, this helps in the spring.