Must have been an earlier post I can’t read now, but what were these new house rules you refer to? I can sense that one of them is no Japanese first turn advantage against UK targets. Any others?
Perhaps you could ensure that sea-borne transports by having a tech available for heavy transports…upping the number of inf a transport can carry to 3…or 2 and one other unit. That way bombers can carry one inf but if you want to move massive amounts of inf you use transports.