Don't tell me you were watching those big bucks this am while I skipped the morning hunt! Nice bucks! Just think how big they will be next season....
Anyway.....I hunt CRP fields quite a bit and will tell you that I see the biggest bucks of the year in these habitats. But that's probably no surprise to you. Big bucks love those big CRP fields, especially those having switchgrass.
I hunt small timber strips -- the ones following any drainage that run through such fields. Usually the trees are small but that's just how it is. The biggest buck I've ever taken in my life I shot last year out of an 8 inch diamater black walnut tree. I missed a 160 inch 8 pointer at point-blank on October 13, 2000 while hanging off a 6 inch diamter osage limb. The buck I shot this year was out of a black locust, trunked straight as an arrow, but barely half as big around as a telephone pole. Keep in mind that these trees are small but they have super hard wood and will hold a fairly lightweight hunter if one doesn't get too high up (my friends think I was born a monkey so you may not wish to follow my crazy ways....)
Anyway, bottom line is that the big bucks are there, one just needs to find a way to hunt them. The thing is many hunters avoid these habitats, because as you said, finding stand trees is tough, because they are small, or because there are no trees at all. For what it's worth, north/south running draws through CRP offer the easiest hunting, while east/west generally make things tougher because they line up with prevailing winds. Of course, that is a glaring simplification and generalization of the pattern....there are tons of exceptions! What else is new, right....but the challenge is what I love...
Ground blinds work in grassy habitats too. But often they must be placed out well ahead of time or deer will shy away from them and brushing them in is often mandatory. Plus, it is hard to predict just where deer will be in those open habitats. So figuring out just the right spot to ground hunt without having deer drift downwind of your local can be tough.
With a muzzleloader your options open up some. I often lay flat in the grass on late season hunts waiting for deer. The surrounding grass traps your scent a little and you have, of course, much more range with a muzzlegun than with a bow.
That is just a little of how I hunt these places. Good luck out there! (Sorry these words may have come out as a big rambling mess....I am typing fast as I am on my way out the door)
Raven