"I don't know why it's happened," he said. "But that's the bottom of the matter. If I knew, I'd have eradicated it by now but it's about working towards not doing it and I'm not far off.
"There's a chance I might be shortening my run-up at some stage to try and eradicate it. I don't think it will affect my pace and I think it might give me more control and more bounce, so I think as I get closer to the crease, when I decelerate, my feet do cross over and that's probably what's causing getting closer to the stumps. When it feels like I'm in a straight line I'm not. But again, I think by shortening my run-up it could potentially help that but with the amount of cricket that we play it's about getting the timing right."
Finn said he would need a solid month to tinker his run-up but given the heavy schedules the top international sides play they rarely get such a break from the game so the change would have to be gradual.
He didn't know whether his shortened approach to the crease would make an appearance in tonight's Twenty20 series-decider against New Zealand at Westpac Stadium in Wellington.
Despite the odd indiscretion at the bowling crease he didn't feel like he was out of touch with ball - as evidenced by when he took 3-39 at Eden Park last Saturday when England claimed the first game of the three-match series.
"I feel in good rhythm, I feel as though I'm bowling well, I feel as though I'm bowling a heavy ball and that's all that matters."
New Zealand skipper Brendon McCullum was asked for his thoughts on the matter of another Finn offence being called a dead ball, meaning a player could be given a reprieve if Finn was to dismiss them but made contact with the stumps on the way through the crease.
"It's not for me to comment on. They're the rules so that's how it sits at the moment and I'm sure that will continue to be assessed as we go along," McCullum said diplomatically.