My Enfield is the only motorcycle I've ever owned with a center stand that doesn't elevate the rear wheel. It puts less weight on the stand and is more prone to sliding in situations that are less than perfect. Then when it does fold to the up position it amazes me how much ground clearance is lost as it hangs quite low. Unless I'm missing some brilliant feature to it it does not seem like one of Enfield's better designs. In all likelyhood mine will coming off along with the pitifully short side stand that will get replaced by one of Hitchcock's adjustable length units.
Comparing my 2012 UCE C5 to my 1999 IB Bullet, there was considerable improvement in the performance of both center and side stands. On the 1999 IB the stands don't seem very well designed, and are built from marginal thickness and dubious quality materials. I noticed the same behavior you mention, it didn't seem tall enough. The center stand springs were also compromised and the previous owner had fitted a loop of strong string to perform the hold-up function. I think that the center stand might have been worn in the mode shown by Mr. Underhill, and was over-traveling, but I didn't pay that much attention. I'll deal with that, and the poorly designed and placed side stand when I rebuild that bike. It's a basket case at the moment.
My 2012 UCE has no such issues. The center stand has performed well for me, and I use it much more than the side stand. It's build more robustly and the geometry seems much better suited to its task than the IB stand. I did notice, however, that when I experimented with 19" tires on front and rear instead of the 18" front and rear that came on the bike from the factory, The center stand did not have enough lift to hold the rear tire elevated. It held the machine stable, and took most of the weight off the rear, but the rear was in contact with the ground. I wonder if UCE Bullets have a different stand arrangement than UCE Classics? I was under the impression that UCE Bullets use 19" tires front and rear. UCE Classic late models had, I believe, 19" front and 18" rear, and before 2012, 18" both front and rear.