1/ Edges: I love big edges, but to be honest, I am thinking 35 to 39 is the max I would go to. How much more edge do you need?
2/ Concaving: Concaving is big right now - and I have it on my main bats. Happy with it.
3/ Grains: Geoffrey Boycott apparently never used a bat with more than six grains. I prefer a minimum of of 8-9 with my match bat having about 18 or so.
4/ Pressing: When I was a kid, bats were pressed like concrete front and back to make them last. These days the face is pressed lightly by the bat making Gods (Keeley, Laver, Kranzbuhler, Bradbury, Millichamp, Pack, etc etc) and the back and edges not at all in order to give the wood more rebound.
Bat making technology has reached its apogee. I would be stunned if bat makers can improve on the present brilliant standard of bats without the ICC and MCC changing the laws to allow performance enhancements that are presently taboo.