Just FYI, Cyber Sub's bombs failing to freeze under normal circumstances will happen maybe 5% of the time, at most. It's very, VERY rare. Any other time, they will free when they should freeze, which is only if the opponent wasn't in vulnerable frames on launch or on hit. Yes, your opponent cannot be in a vulnerable state when the bomb hits OR when it's actually thrown out.
I main this character, and I've likely put more time into him than the other dozen characters I play combined (no exaggeration). Ask me, ask Pig, ask J360, ask Usedforglue: I guaran-fucking-tee that these people will tell you the same. You won't find anyone more dedicated to the character than the four of us, and all of us seem to work around this limitation just fine. There's no reason you can't.