If you wanted to do a +7 you could do that, but I don't think you need to do the +10. His nadir is around +7 to +9 so getting a test near that should be enough. Even a +6 is good enough as you said he's doing a more gradual drop. You've also got to factor in that they usually don't see the full effect of the dose increase for a few cycles. For my night time tests, I always ask the question "is there a chance she'll go low (below 50) tonight?" If the answer is No, I go to sleep and save the data gathering for daytime.