You can't be programming the tray properly, when you load the tray it tells you what it thinks is in there, hit Change Settings and program it as what it is. The paper ream should tell you enough to get it right
And program it here
The fully tested Xerox supplies are in the RML here. Since it has settings for weights listed, you should be able to run anytyhing you come across as long as it isn't bad quality or an unsupported weight/type
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I had a Xerox Workcentre 7220 for 3 weeks. It jams every now and then but after I tries to print with glossy cardstock it would not let me print a thing. In fact, the copies look like globs of ink dried on the side . I got some good copy paper in there. Should I get the heavy copy paper?