If it were me, I'd get a test in no more than 30 min to see how numbers are going in response to the 8%.
Just an FYI--
I'm assuming you were indicating that the 68 was a 2-1/2 hrs after shot time. First, if that's the case, it belongs in the +2 cell. Rather than abbreviate the time as +2:30 (which I read as 2:30 on the clock), portions of an hour are in a decimal system. So, half hours are 0.5, a quarter hour is 0.25. So if you shot at 7:00 and then test 2-1/2 hrs later, it would be +2.5, 9:15 is +2.25, 9:20 is +2.3. Does that make sense?