I have e-mailed Yao Weibin, but wanted to give an update here regarding my findings. It appears the issue is linked to long strings of text unbroken by a new line. With my settings, it appears that if a line contains ~40k bytes without being broken by a new line, something occurs whether gzip is on or off, that causes the gibberish to appear on the page.

Thank you all for your input so far.