>_> peach vs. luigi....eww I see that matchup so much it almost haunts my sleep.
Pretty good stuff (certainly better than my peach), Dark.pch, your peach is getting pretty quick. I'd have to agree with that usmash comment, its not a particularly efficient/effective edgeguard in a lot of matchups. The luigi I play with probably could punished you hard 50% of the times you missed that with the ledgeguarding...still, all in all, good mindgames.
You seem to have trouble when you get stitchface though >_> My crews peach main uses a tactic similar to yours, except all the float cancels are used to force people on the defensive (actually treatening to hit). She usually throws stuff out like she isn't even holding the turnip, then *WHAM* they eat it. Sometimes she holds on to it so long peach just drops it when getting hit, but I'd say maybe 3 out of 5 times it makes contact in one way or another.
Just get more crafty with trying to work the throw in. Think of it this way: When you have stitchface, they expect you to throw it. Their focus will be on preventing the 35% from that turnip, not much of anything else. Knowing they're on the defensive will make them predictable to a certain extent beyond how they usually fight. Take advantage of this, throw them off balance before you do, and your hit rate will probably go up quite a bit.
Good peach though.