I did the same sort of progression in junior sailing, I got to big for optimist pretty quick and soon to big for laser radial, which is all they for juniors locally. Past that the 420 is the only boat used for high school and college Sailing, which is to small for most big guys to sail in. At my size I weight more then the boat itself. The only junior class I could sail in is thistles, this fleet briefly resurged but died out when people aged out. The skinnier class of kids following them wanted nothing to do with the Thistle. As someone who plans to be a lifelong sailor it is unfortunate to lose my last years of junior sailing and not being able to sail high school or college sailing. Taking the politics out would help as well.