have i changed to a less profitable style?

[Pog0]

Playing $1/$2, I've experienced a large change in winrate but have also noticed a change in my basic stats and am trying to see if there is a causal pattern to them.

In June/July I was winning 3.1 BB/100 over 22k hands with 19%/10%/1.7
In August so far, I am winning 1.16 BB/100 over 11k hands with 15%/9.5%/2.4

I know that I'm giving very little information to work with here. Had my basic stats been similar to what they were during my better winning period, I would have no problem attributing the winrate change to variance, but since there's a significant change to my style of play, namely, tighter and more aggressive, I'm trying to figure out if I've changed to a less profitable style of play for the level or am being subject to one or a combination of worse overall play and worse luck.

Any insight? Do I need to be seeing more flops or have I improved my game and got hit by variance?