You mean the blue line? For the hits graph, i just leave it at the default of 5. Remember that the blue line is a "moving average" so for sure it will be rising in all the gats which were selected for best build-up.
Before I switched to buildup, it was AGonizing trying to decide which gat to choose.
It's so much simpler now just choosing the most commonly selected numbers from several gats.
As for what else i look for in the graph, it's pretty well what Anastasios has already described as important for the build-up mode. If he says it's important that's good enough for me. So do some searches on this forum for what he says about buildup mode. The one thing I do remember that I think he places importance on is this - that there is a regularly climbing red line at the end of the graph. That is, a REGULAR improvement. That is, ideally, for example a one-hit, followed by a 2-hit, followed by a 3-hit, followed by a 4-hit, followed by a 5-hit, followed by more 5-hits. Anastasios, if you're reading this, please correct me if I'm wrong. But the program already places these gats (in buildup mode) in priority in the column - that's why I don't remember all the details of the priorities.
But also look at the last time there was a zero-hit, and I give preference to the gats which haven't had any zero-hits in the last part of the graph, even before the regular ascent hits started.
Hope this answers your questions - sorry if it's rambling.