I dont really think you can blame lambert on your uni, you stated that it was a cheap uni in the first place, and i really doubt that it was made for muni riding, there are muni's out there for sell, but a quality one is over $400 (I looked, still thinking about getting it).

Anyhow, i guess you get what you pay for, im sure what you learned on this uni well pays for its self, maybe its time to move up to a real muni if your doing thoes kind of tricks