There's not much intrinsic on DITM calls, same as DITM puts, so a small chance that they'll get early exercised too, can also be that the stock reverses faster than you can close them out - has to be a face-ripper one of these days, no? But when, that's the question
But I understand the approach, I did the same selling 10x Jan 6th -c115's, there's $3 Theta in the premium, one of the reasons I didn't sell -c100's was lack of extrinsic... but I only did this with less than 10% of shares, so I can easily roll them if the SP were to take-off...