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You can disable chm support in the BetterZip QL generator, but it's a bit of a hack. To do this, right-click the BetterZipQL.qlgenerator bundle that you copied to your /Library/QuickLook folder and select "Show Package Contents" from the context menu. Now open the Contents folder in the new window and open the file Info.plist in a text editor like TextEdit. Find the line 121 (in TextEdit press Command+L and enter 121). You will be taken to a section that reads:

<dict>
<key>CFBundleTypeRole</key>
<string>QLGenerator</string>
<key>LSItemContentTypes</key>
<array>
<string>com.microsoft.chm-archive</string>
</array>
</dict>

Delete the entire section (8 lines). Be careful not to delete or change anything else. Finally, save the file. That's it.