I always send to an aux with a reverb on it rather than inserting into the instrument channel - this gives you a lot more control over the verb tail itself, you can sculpt it with EQ and expand it to manage the decay more precisely. Also, keep in mind the sonic qualities that "catch" reverb more readily: transients, or at least distinctive attacks (vs a sustained pad type of sound) and, notably, upper mids. Try experimenting with enhancing the 1-5K range a bit, not necessarily on the dry piano, but on the reverb feed - insert the EQ on the aux ahead of the verb. If you get more reverb definition this way you may be able to back off on the send a bit and that might help address your concern with muddiness.