I could open Hand 1 2C but it would be 10-14 natural rather than strong. Of course this hand is too strong for that, so:
1C = 15+ nat/bal or 18+ any
... - 2C = hearts and diamonds, GF
3D = 15-17 with 5+ clubs and 4+ diamonds
... - 3H = nat
3N = nat
... - 4D = nat, slam interest
5C = accept slam try, 2 keycards without DQ
... - 6D
I recently changed systems over a 1S overcall so part 2 is a nice chance to practise
1C - (1S)
... - 3C = 5+ hearts, 4+ diamonds, GF
3D = nat
... - 3H = nat
3N = nat
... - 4D = nat, slam interest
5C = accept slam try, 2 keycards without DQ
... - 6D
Part 3 is the toughest. Below is a first thought although I am sure it can be improved
1C - (2S) - 3H
3N - 4D
5D - 5H
6D
For Hand 2, I have not invested a great deal of effort in system for 25-28hcp hands as yet but as it is:-
1C - 1D = 0-8 any
1H = 18-20 any or 23+ bal
... - 1S = relay, most hands
3H = 27-28 bal without a 4 card major
... - 4C = major ask
4D = 3 hearts, 3 spades
... - 5D = strong slam try in hearts
6C = accept, and btw I also have 5 good clubs
... - P (at MPs I would be highly tempted by 6H though)
I am interested that you play (1H) - X - 2C - 2H as a good raise Yeti. How do you handle the traditional hands for the cue bid?