well I'm a small block guy so I'm a bit slow.... My 60 changed quite a bit going from 5800 to 6200. Definitely didn't get up on the tire like the lower stall one did. I didn't experience loss of traction with the stall increase, but loss of performance was definitely noted.... unless you are talking strictly bracket stuff because the 1.34 60 times pretty much every hit made the car very predictable. Our last visit to Famoso I ran my best ET to date Sunday am and that definitely wasn't "good" air. That's with the "other" converter I bought that is tighter. Dave also noted it was definitely up on the tire over our March Meet passes. Think data from that weekend we're around 1300 DA. Can't say this is your issue.... but I sure wish you'd kept the old converter and could throw it in for a weekend.