I'd do less cc and wait a couple of years to add the crappie. Get the largest walleye you can. Bump the YP up. I think this will give your YP a chance to establish as they're very easy prey for your predator base - crappie will be easier to control once the predator base is strong and able to keep them limited - you should see faster growth and better overall RW's out of the crappie this way.
I fish a 2 acre pond that had 25 cc added 4 years ago, they were about 8-12" at stocking. The pond has bg, bcp, lmb, warmouth as well. The cc are 7+lbs this year and growing very well, very easy to catch too! That small stocking number allows them to grow quickly and not out compete the other fish in the pond. Its a heavily pressured public body of water and honestly has the best balance of all species I've seen anywhere.
You'll have quite a fun place to fish with that combination
