Ok, as no one has asked the obvious, I will.
Wilhelm, what mods do you have enabled?
Secondly, have you tried Rubini's Stay Alert mod? This increases your boat's sensor range.
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I would just like to remind everyone that all the escorts in GWX conduct expanded search runs when moving with a convoy. The front, side & rear escorts will all excelerate and peel off from the convoy route to conduct this search. Now, if when they do, they happen to cover your approach route, then you will be discovered. These search patterns must be observed before you make your attack approach.
Example - Last night, Oct 10th 1942 Op Drumbeat, I attacked 2 convoys. Weather was reduced visiblilty & 14m/s wind/waves. Each convoy had 6 escorts, front, rear & 2 on either flank. I recieved a radar warning at about 19km range, I tracked this for 10mins to get generalised heading & ran a parallel course, until I was infront of the convoy route. I submerged before visual range, perhaps 10-11km out. From there I ran at periscope depth at 2kts until I was inside the lead escorts course. Only then did I raise my scope. 2 Large Tankers, Large Merchant & a Liberty Cargo were sunk on that run. The escorts all reacted to my presence after the first torp impact, however, they all proceeded to where they thought I'd be, which they decided was 1.5-3km from my actual position. Not once did I have to take evasive action or infact leave periscope depth. This was partly due to the Americans having poor equipment but mainly due to the weather conditions/sea state.
Since the creation of GWX 1.0 through to 1.04, none of the testers have complained that the AI is too hard. (well, in fairness, the first time we tried 1.0, we all shat ourselves

) Results are obtainble but you can't expect to return from every patrol.
My 2p.