I've just started a new campaign on 100% realism (so including manual targetting) and I can say that the manual targetting has been working 100% better for me as of patch 1.3.
Since I play with Imperial measurements, manual TDC was almost impossible for me in 1.2 until CapnScurvy released his excellent "Imperial Range Fix" mod:
http://www.subsim.com/radioroom/show...imperial+range
Now with patch 1.3, all of the Imperial measurements seem to be working correctly without any mods at all, and I've had a near-perfect success record with all my manual TDC shots so far. Granted, I've only sunk a handful of ships so far: three Large Modern Composite Freighters, two Medium Old Split Freighters, and a Small Split Freighter.
But out of all of those ships I've only missed with
one torpedo, and that was because I set my spread-angle a little too high.
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Since I don't haven't gotten around to making an IS-WAS yet and I don't have a slide-rule, I've been using Centred75's excellent
Imperial Navy Ship Recognition Manual which I
highly recommend checking out. He's included complete quick-calculation tables AOB, Speed, and Range on all ships without having to do any calculations. (Thanks Centred75, if you happen to read this!) Here's a link to his thread w/ the manual:
http://www.subsim.com/radioroom/show...ighlight=INSRM
nomad_delta