The Cubs were an excellent offensive team in April. They were a mediocre/bad offensive team in May and June. If you want to talk about inconsistency, you could point to that, and the whole they dug themselves which turned the whole second half into a playoff chase and eventually decimated the bullpen. From there, in the second half that you mentioned, here's how they went:
July: .336 wOBA, 5th in fWAR, 15-11, 150 runs scored, 5.7 runs/game
August: .324 wOBA, 10th in fWAR, 18-9, 149 runs scored, 5.5 runs/game
September: .336 wOBA, 7th in fWAR, 12-16, 151 runs scored, 5.4 runs/game
What kind of consistency are you realistically expecting here? I really don't think my response came off as a personal attack, even setting aside the fact that we keep posting these numbers and you responded with 'Summarize it in sentence for me' which is...whatever. Outside of the Braves, every contending team I looked at in the NL scored 3 or less runs over 50 times last season. It's just....how baseball works these days.