One things for sure, at your weight on that board, you're sure going to catch some waves.
If it's a nose rider you're probably going to be doing a different style of riding compared to the Walden so the length is not so much a factor.
You will want to move around a lot more and do big deliberate turns off the tail with all the front of the board rearing its head out in front of you, then moving up quickly to trim and do it all over again in the opposite direction.
Is that the type of riding you want to move towards?
Or do you think you'll always be a hotdogger who prefers the shorter style?
Keep in mind that these thoughts are coming from someone who can only do these things in his dreams