WM6.1 Kitchen WMP issues

[solius]

ok so i recently loaded the WM6.1 kitchen onto my VZW 6700 and it works flawlessly...so i go and purchase a 4gb mini sd card to put some music on it to use the phone as am mp3 player as well....i go into wmp and do update library and it only adds like half of my music to the library and sometimes it wont show up at all...ill click library>storage device then do My Music>Artist and there will be nothing there so i hit back and click artist again and then about half of them will show up also when i start a song the first 20 seconds is choppy as hell...any kind of fix for this? or anything to at least get it to load all my music in the library?