Yes I do have that 'problem' with Optimal Bluegill. Or at least I have with my second and third bag. I did not have that problem with the first bag. 5-10% sinks slowly upon hitting the water. The rest begins to sink after a minute or two. And I've come to like it that way better. I'll test Optimal BG Jr. this weekend and see how it does.
As far as the Optimal Bass floating, I didn't hydrate any and try it. I may if I get a chance. But some of it floated several minutes beyond when the Optimal BG went below the surface. Hard to tell though because I have so many FHMs hitting both types of pellets that they eventually get pulled under by them or eaten by larger redears.
Where did you find the Jr at?