Sell April and buy May
I don't understand this concept. So you sold your April long for a 2tic loss, but got right back into a May long, which could fall even further. If you sold your April long for a 50 tick loss, would you have then bought into a May long with that 50 tick loss? How is this a "roll"? In an instrument where forward months mirror the spot month in price action, it doesn't mitigate anything in my experience, because most months follow each other. What one does in price action, the other does.
I am not wording this correctly perhaps, but in my mind, selling a long in one month and then buying a long in another month is not a roll. You are just taking a profit or loss in one month by going flat, and then getting right back into the same position in another month. That's just standard buying and selling as if the months were the same, because the different months' movements mirror each other.