Welcome! I started Kaplan in August of M2. Didn't touch world until that December. I did about 40% of Rx and liked it a lot, especially since it has the FA pages right there for you to see. Kaplan was good, but so many of their questions are way beyond the scope of step. I liked Kaplan pharm better than world (thought they were more challenging), and their path was also really good.
I'm a DO student, so also did some COMBANK
Starting in August (with a different bank) is a great idea, but I think it's key to remember to maintain your focus on classes. Questions are the most important way to prepare for boards in my opinion, but nothing makes up for a poor foundation, so youve just got to find a good balance.
Another thing I did was keep a Uworld journal. Not sure if you've read about this, but I'll spare the details in case you have
it was crucial for retaining the massive amounts of info in world
Edit: oops just saw the part about flash facts. I used it a bit during dedicated and it's great. I would say if you can incorporate that into your classes then go for it, but if it's taking away from class time I wouldn't mess with it until dedicated. I made quizlet cards during the school year