I have been using a similar strategy of buying later dated, higher strike calls as I roll the calls forward. I have sold all the shares in my trading account and bought laddered ITM calls. As they get too deep in the money (alas!) and too near expiration, I sell, bank half the money and try to buy the same number of calls again at 1/2 the price. Seems to be working fine on a day like today, but any strategy would. After surviving Jan11 I guess I'm not afraid of heights.