Funny you mentioned that shop in Rosemead, it’s was brought up a few days ago in a conversation with some old timers. Anyways, try hi’s tackle box in south city. They are starting up rod building again. Another place to try is rusty hook and coast side 2 in Pacifica. Rusty hook use to do custom rods but not so sure now (been over fifteen years since I’ve been there). Coast side can point you in the right direction since it’s so popular with the locals whom, more often than not, use custom sticks. Good luck.
Btw, look into black hole slow pitch rod blanks. Very parabolic bend.