Oh woops, I totally forgot to do that first one, it's added now. And I'll see about that 2nd one to see if it'll add to your block or not.
1. Ok.
2. I'll reduce it a tad, but not by 1/2.
3. I changed the drop rate a few weeks ago so that all normal bosses have a 25% drop rate for all gems, and bosses like the phoenix (or ones specified as a elite) have an increased drop rate for gems III & IV.