What difficulty futures should I purchase to maximize the mining income? Specifically, at what strike price, and what quantity.
Maximize with chance of loss or maximize risk free? If you are not willing to take risk and want maximum income, then simply mine away and take no futures whatsoever.
I think I follow...
But I believe the statement:
Assume, I believe I'll have miners in hand on October 1 and difficulty will increase linearly at 25%.
specifies my parameters. Thus, I wish to protect myself against either a) difficulty increasing because I haven't received the miners before October 1; or b) the difficulty increases beyond 25%.