We're aware of it.
Also, 76mm is not the same as the 17 pounder. We already have 17 pounder shermans, unfortunately only the British and Canadians use them. The only American 76mm gun we have ingame is on the M10, which is much weaker than the 17 pounder, however still much stronger than the standard American 75mm.
Also, for those wondering, Operation Cobra has been observed on our test server. It will not be in 2.2 unless you see it in a news update prior to release.