Your rotation has been very good. I'd say it's more on the strength of your back end rather than an overwhelming front end, which makes things dicier come playoffs. Your 2-5 is more like 4 3's.
That being said, not being worried about your offense baffles me. Your offense was awesome when Betts was hitting like Bonds circa 2012, JDM was in the running for the batting title and Mitch Moreland forgot he was Mitch Moreland and was OPS'ing over 1.000, ie your offense was unsustainably killing it with a hot top 5. Since Betts started hitting like a human being and Moreland came crashing down to earth, your offense has been pedestrian. Your offense carried an .800+OPS through June 1. Since your lineup became mortal, your team is 21st in runs scored and 19th in OPS. In the AL, your team is only ahead of KC, CWS, TB, and Baltimore in runs and only ahead of those same teams plus Detroit in OPS. In June, your team's OPS is .080 behind the Yankees, and they are slumping in June and nearly 200 points behind Houston, who is killing it. And while your starting pitching has been very good, it isn't the best in the AL (not by a long shot) and is only marginally better than your closest rivals in terms of ERA and your pen is noticeably behind your chief rival. If your pitching was like the O's circa 1971, then I'd say don't worry about it. But your pitching isn't head and shoulders above the rest and your offense has shown its colors once your top 5 stopped hitting at unsustainably ridiculous levels. Your lineup requires lengthening. If you don't lengthen it, then the chances of your team winning it all are small