There were a number of reasons why the U-boats had an easier time during 1939-40. The RN ASW forces had deficiencies tactically, operationally, and strategically. But I can't recall ever reading that either ASDIC hardware or operators were ineffective in that period. I'm currently re-reading Blair (Vol 1) and well into 1941, and he didn't mention problems with ASDIC in the early years. From what I have read, ASDIC did become even more effective as the war went on, but it doesn't seem to have been ineffective early on.
It seems you may have based your perception on a mod which, while designed to give an interesting gaming experience, was not reflective of historical capabilities. As sublynx said, either GWX or LSH will give you a less stressful experience.
Wish I could remember who wrote it: "NYGM doesn't have the best graphics, but it gives you a nice, accurate death."
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