(edit - this is in response to last post, not original post.)
Japan transports worked so damn well in Revised, I can’t imagine that Spring 1942 is much different. Of course, now you DO have two Allied subs running around, but I think that’s an inconvenience the Japanese can easily overcome.
I suppose I never bothered to post on a Japan strategy because it always seemed clear to me - you get 5 or 6 transports ASAP, using 4 to transport infantry(mostly) with a couple artillery and a few tanks from Japan to Asia, and 2 to pull infantry from the islands, either to reinforce Asia, to run around screwing with Australia, or to hit remote targets at Africa - or ALL of those in turn.
You do want Jap tanks on the mainland early, but I think it’s best NOT to try to mass early on - the tanks just don’t have enough punching power against a good Russian player to threaten anything worthwhile. Best use infantry plus air support. You want a COUPLE tanks, yes, but best concentrate on infantry early; that’s all the more that will be knocking on Moscow’s door when push comes to shove.
Once you have the production lines rolling, it’s time to think about an IC in India or French Indochina. Probably not BOTH though, until extremely late game. I use transports a LOT with Japan.
As far as hunting down the UK/US subs - well, keep transports with battleships, or with carrier/destroyer groups. Not too difficult considering Japan’s massive navy/air force; you don’t need a fleet of destroyers; three is plenty.
If you’re thinking destroyers are “too expensive” - I’d say think of the benefit to grabbing Australia/New Zealand, and utilizing the Japanese infantry on the islands. There’s 24 IPC worth of infantry on the spare islands; I can certainly blow 16 IPCs on destroyers to get that 24 IPC worth of infantry into play.
I’m really not a fan of two Japanese ICs. Think of this - say you spend 15 IPC at French Indochina to produce THREE units. I’ll spend 14 IPC for transports to get FOUR units to the mainland a turn. Furthermore, whatever you produce at an IC must pop out at that territory. There’s a slight delay on transports, but they drop their cargo anywhere along the Asian coast, or even hit Alaska, Australia, or Africa as desired.