I think if you are asking for something that will cut deep thick grass smoothly, evenly, easily and cleanly on a single pass you are going to have to invent something, because it doesn't exist.
Cougsfan is exactly correct. I have tried 5, 6 and now 7 ft bush hogs on 3 different tractors over the last 20 years. Also a Landpride 2672 finish mower. In the last 5 years a 7.5ft Alamo flail mower.
None will ever give you a smooth cut (lawn-like) if you start with deep grass and especially deep WET grass. Depends on what you want and what you are willing to do to get there. If it is high quality cut, then how OFTEN you cut is the key sort of regardless of tools. Have to stay away from tall grass. And for the most part stay away from wet grass too.
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If you cut often the 3 bladed finish mower (or for that matter a good ground following belly mower) will do the smoothest job.
-- Since you have a
B2650, the Kubota belly mower is ground-following and hard to beat unless you have to let it grow a foot high before you cut. Pretty much same with the Landpride fionish mower. Unless you field is too big or your time too limited to cut it often, for Pete's sake use a belly mower on that great
B2650!
-- The flail mower does a fast, easy job in deep grass and even somewhat wet. The result is NOT smooth lawn-like "flat-top haircut" quality but it is very uniform. Bumpy ground is not great for a flail because the roller runs on the ground all the time. It will not work well if you have obstacles like a lot of rocks or limbs that are 2" in diameter, etc. You can do that, but you'll be off the machine replacing flail knives so often you won't like it. I find it ideal for seasonal cutting of meadows where the grass may be 2 or 3 feet tall and the hay people have decided they don't want the grass or it is on too steep a ground for their hay equipment. Not so good for pasturefields where rocks and limb debri exist.
-- By the way, you may want to look around for a used flail mower of good name brand (like Alamo.) Auctions are great source. The darn things are too expensive new (worse than $4K.) They are built like a tank. Even when beat up for years by a state road crew or whatever they can generally be refurbished and serve well. I got mine for a song, replaced drive belt, a few knives, return spring and roller bearings and it is a real workhorse. Ideally rotate between the flail and the hog and use both as needed which is what I do.
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If you can't cut often, the flail is fine but won't give you a flattop haircut look. [Nothing will.] But for tall grass where the goal is the smoothest cut, a good sharp Bush Hog is the best tool in my opinion. Pay attention to the angle (front low, rear higher) and to adusting your hyd lift settings. They make a lot of difference in quality of cut. Friend of mine uses a very old bush hog which is 4 bladed and that delivers probably the smoothest cut obtainable in tall grass.
