You're in great shape man, props.  You seem to stay lean year round as well, Which few can they they're able to do.  But, why Classic and not physique? 
thank you! 
 - nothing special, best advice i can give is get a meal plan and compete 2x a year. so you paying to be lean and gotta be lean a few times a year. 
at heart i am a bodybuilder and i love posing/being on stage hitting a front double bicep, but i would get crushed in a bbing event being 6'3'' and even though there several physique guys who would wipe the floor with me i just dont consider it "bodybuilding"
with classic its 5 standard poses, plus a posing routine etc  which is legit. 
i am always on the light side for mens classic, but i will compete in what event i like -