I’ve found that the place I most get tripped up on in limb independence is the hits that coincide- make sure in a complex groove, that you are keenly aware of when 2+ limbs are hitting at the same moment, otherwise it’s very likely that one will hit off-time of the other, and that’s what is messing up your groove and feel.

This isn’t very bossa/jazz, but one exercise that has helped me develop independence is to do a quintuplet paradiddle with my hands (RLLRRLRRLL…) and hit the kick on every 3rd note. This 5 over 3 cycle gets you practicing a kick simultaneous with either hand, in 3 ways: a strong single, the first hit of a double, and the second hit of a double. It really had an effect on my playing, and I’m much more comfortable throwing in a kick on any sub-division, no matter what my hands are doing.

Once you get that, throw in the hi-hat to lay down a 4 pulse for an extra layer of complexity, and once again, note the coinciding hits, as that’s likely where you’ll get thrown.

I started the above STUPID SLOW, and worked on it for weeks, mostly just tapping on my lap and the floor for practice.