Let's get something straight.
I'm not telling that your k+n is bad.
I'm telling you that its one of the best ones out on the market.
It has been researched and designed more than any on the market.
Why I'm saying less agressive is that k+n found the sweet spot for the MAF that's closet to stock.
So NO don't go out and spend anymore money. You have a GOOD cai.
Peace!