The very first mod I installed was RSRD, simply because my very first warship contact ever in the game was a Japanese task force of 7 (!!!) BB, 6 DD and ~5 CA accompanied by 2 or 3 merchants which managed to cruise around at 6 knots only, driving in wild circles like being drunk, without the slightest coordination and accidentally ramming one of their DD and sinking it.
That's when I thought: "Ugh, this is so pathetically wrong, this needs a mod to improve it."
Installed RSRD and was happy
But yes, convoys should be more frequent, it's late '42 in my game and I haven't seen a single one.