Diane you are aiming to get Tyler's BG down to lower normal numbers so if he is still sticking in some blues with some green or all his greens are in the 90s, you may need to increase the dose to get him to come down to the lower BGs. Yes you can increase every 6 cycles if need be.
When we talk about going below 50, that means any time, preshot or during the cycle. When you are looking for 3 drops below 50, those drops have to be on different days. So if Tyler were to hit 49 twice the same day, that only counts as one drop below 50. If Tyler drops below 40, then that is an automatic reduction.