sorry i disappeared for a bit.
i think i'm going to reinvestigate. my road conversion has shorter dropouts, and both my chains are configured so that the axle sits all the way pulled back (i run brakes and would have to adjust slightly...). it might be possible for me to take one link off my 17t chain so that it sits a bit more in, and the 15 is in all the way at the end of my dropout. how much length does a link translate into again? about a 1/4", right? a two teeth spread should be good with this one chain, i'd have to imagine.
i don't think i trust masterlinks, but it might be because i'm superstitious about these things. thanks for the input guys, appreciated.