Frank nailed it on the head if you're a B-main guy like me. I made the transition to the laydown after taking a ~3 month break - coming back the car felt like a different type of buggy because of my driving skills (lack of...) and rust. Now that I'm 6+ weeks back into racing I see how my times are better with the change to the laydown (I'm now evaluating the dirt tranny).
At the end of the day for me it comes back to driving cleaner/smoother/smarter. The buggy rewards stick time - find a setup you like, stick with it and you'll start to shave those tenths off the lap times.