H.sie's wolf-packs mod definitely functions as H.sie states.
I've used it countless times, during war patrols over the years since H.sie and LGN1 created it.
BdU may tell you to wait up to 36 hours before you receive orders to attack - but usually the attack is ordered more quickly. You presumably have H.sie's options selector to hand (and, incidentally, I've just created a new version described in this thread
http://www.subsim.com/radioroom/showthread.php?t=236848).
Therefore use the Options Selector on your patched version of SH3 to reset the two oxygen supplies correctly and to tick the box labelled 'Wolfpack less contact reports' (and make sure you've ticked the box for wolfpacks too, of course!) The 'less contacts' option means that you have to provide fewer radio reports to BdU before you are ordered to attack.
Check also that you have added the U-boats for the wolf-pack to the correct campaign file campaign_scr.mis (search for the key word 'wolf', should appear several times in sequence, and before the entries for 'ordnance'.)
Stiebler.