Thank you very much! It's a brilliant strategy that I didn't fully understand the implications of, until reading your post. Because you are using LEAPS as part of a strategy to accumulate shares instead of buying on margin for $120 per share? Congratulations on a brilliant trade!
The only way that I'd considered using LEAPS is to make money, which is different in some huge ways from accumulating shares. Example, for other readers, if the SP drops by 20% to $800 per share in November 2018 and then recovers in February it doesn't matter with your strategy to execute your options, because you will own the same number of shares either way. But since I'm going to convert the LEAPS to money I'd lose $200 per contract or $20k total per contract!
If you are keeping the shares, and the "interest" is only 1 or 2 percent there is absolutely no reason to execute early. You might as well use the funds for something else in the meantime.
I have one question or suggestion. Since you were confident that the LEAPS will be profitable, probably by at least 200-300 percent, why didn't you buy more than you want to exercise, since the profit on the additional LEAPS could easily pay for the execution? Free is definitely better than $120 per share!