hmm. i dont call it planky planky.

but some people like it like that. (ala... ericthecableguy :D ) my friends in some thrash band and his strings always are slapping all over the place like rubber bands.

but give it a few weeks of playing. keep in mind that strings are never at their best when you just put em on. they go out of tune, dont give you the right tone, dont bend as easy, etc.

also, if the buzzing and slapping doesnt subside after awile, you may want to loosen all the strings and raise the bridge up a bit. (to raise the string height)