Good shooting, fillae - sounds like you've got a keeper there.
From what I've read, you're doing the best thing for a new barrel - shooting conicals. They say that this will help smooth out and roughness that might be there from the machining process. You might see those groups begin to tighten up some as time goes by. Some guys find that by using a Wonderwad under the conical, it improves the groups as well. Too bad about the flinch thing. I know how that can be - and once you start, it's hard to stop. Kind of like "target panic" with a bow.
When you get that Limbsaver pad, you might want to drop your charge back even more, and just spendsome time shooting at the 30 yard distance. Have fun without the heavy recoil, and see how many bullets you can put in one ragged hole. (Maybe even get some ball-ets - I think they're a little cheaper, and will also offer a little less recoil. I think you can get them up to around 300 grains.) Then gradually increase your charge and distance - maybe that will help get past the flinching and break your barrel in at the same time.

IM jaybe