I watched the Lucario match, and I have to say you handled it well, as far as avoiding his stuff. Though I think you really need to learn your kill moves and stage control tactics so as he doesn't even have to take that much damage to die. Basically, learn your kill moves.
For the Tink match, yeah, he controlled the match for the most part. Once again, learn your kill moves and your damaging stuff. You're well on your way (are any of us seriously Brawl veterans after only having the game for less than a month?).
My last comment to say is just that I feel you should be more defensive and more technical, though you have the shield-dash grabs down better than I do. Try to let your moves auto-cancel in the air, hyphen smashes, and overall holding your ground in a defensive manner.
Happy plucking. ^_O