I'm surprised this thread has not gotten over to the subject of "not all RFM's are created equal". There are RFM's and then there is the Woods RM990, a heavy-duty commercial-quality unit with swing-back blades. If you search TBN for RM990 you'll find lots to read. I've used RM990's for many years on my old orchard land which has evolved to look quite good. I set the height to 5-1/2" which makes a good job without making the mower do earthwork.
rbargeron
That's the one I have used for 20 years and described earlier in this thread.
Others on here argue, "look at the name, Finish Mower" and other reasons not too use one, based just on their own limited experiences or equipment.
As I recall the OP has both a finish mower and a bushog and I urged him to try a couple acres with each to see what can be done with his equipment.
Some don't seem to realize that finish mowers would not have height adjustments of up to 8" for cutting lawn grass. I recently cut a field that had hay grass 36" high that had gone too much past prime down to 6" with my Woods and will cut it again to 3.5" if we ever get any rain. It will rot in well and disappear after 2 cuts and some rain. With a bushog it would look lousy all summer regardless of how many more times it is cut. I used to do it that way, so know from experience. Bushog blades are dull and have no suction so they do not recut the stuff already except for the windrows that are created in strips. Even then it is mostly just spread around like a tedder would do.
We keep a fenced horse pasture cut to 3.5" starting in early spring to avoid
green grass colic of the pig eating horses and to keep the weeds gone. The blades spread the horse apples at the same time.
But as you said, the Woods is built tuff with a wide B belt and sheaves that have large tapered roller bearings. It weighs 1,000 pounds.
I'm really surprised to see this thread grinding on and on. If the equipment is built to take it, use common sense and listen to the tractor and mower, try both ways and see. Or do a bushog first and follow with a finish mower. If you want it to look good continue with the finish mower every couple weeks depending on the rain and growth.