4 speed ka-booom !

Well first off, I'm a little curious why your shift rpm is so vague, and so short. But I suppose you haven't had enough time or enough runs, to have that nailed down yet.
Otherwise, like Marco says "go for it."
BUT, IMHO, not deglazing the cones, leaves a lil something on the table. And not to challenge anybody, but I had very little success using synthetic in my tranny until I modded the cones. That stuff is some slippery!I suspect Marco has some tips on using synthetic.