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Susan, it's pretty hard to tell what's going on or what to do without seeing the piece, or knowing more about your materials and methods.
Perhaps someone who uses Max Horbund's #3 medium can be of more help. A glazing medium should be "fat" enough to be relatively easily removed with mineral spirits and a soft rag . . . or perhaps spike, if something stronger is needed to "bite".
What's in Horbund's #3? A cursory websearch doesn't reveal it as a "market" item. Did you study with Max Horbund? What colors did you glaze with? Is the medium recommended for glazing?
All else being equal, it's not unusual for a passage to "sink" and appear dull. If you are in general happy with the results, a light spray of retouch varnish should solve the dullness without ill effect. I prefer copal retouch.
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