My initial thoughts:
Problem A: 3H For now, I will show my stopper, and try to get to 3NT. By the time I make my final decision, it may be back at my current second choice 3S. I expect 3S to be a decent score because it is such a powerful suit, but 3H or 3NT to be the 100.
Problem B: Pass Not anxious to double or overcall. 2NT is my second choice, but the risk of balancing them into a game or us into a penalty is greater than finding a good strain
Problem C: Dbl This one I have to check whether negative doubles are played this high. I intend to get to game or slam opposite, but may run out of space to explore. I will have to rethink if this is a penalty double.
Problem D: Pass This call is unsastisfactory, but 2NT opposite no entries is worse, as are double without hearts and 3D without assuarances that partner has length. Perhaps I will get lucky and have partner balance with length in one or the other red suit and shortness in spades. I now sort of wish I had lied by bidding a very heavy 1NT; at least I would not feel so helpless now.
Problem E: 4C To show strength and at least two places to play. Patner could have a 3-card major, so I want to cater to that instead of jumping to game in my Jxxx.
Problem F: 2NT I want to be in slam opposite the least encouragement. I will start by showing both suits, then listen to what happens next.
Problem G: 3D Never been a fan of manufactured reverses, and outside of diamonds, the hand does not revalue upwards. If the diamonds were AKQTxx, I probably would have rebid 3NT. They are not, so I will make the normal value bid.
Problem H: SJ I will not lay down the DA - too easy for it to set up something in dummy while having the ace be ruffed away. I also will not lead my trump, automatically pickling anything partner might have. A club is a possibility, but which one - the 10 to retain the lead if possible, the 6 2nd from nothing, or low to imply something in the suit?