I have the Mercier Galaxy AL road bike and recently purchased the Profile Design T3+ Aero bar. Today I went to set this up and it's given me absolutely nothing but headaches, but I got these because I thought they were a reputable brand and high quality aero bar. Basically what it comes down to is I can't get these tightened down enough on the handle bar so they don't move. The aero bar comes with these really annoying plastic shims which are supposed to make it fit a 26mm bar, but even though I can get them fairly tight so there's no lateral movement on the handle bar (this is after also wrapping the bar with several passes of electrical tape) then the aero bar wants to pitch up and down if I put weight on them which I'm sure is not right.

What am I doing wrong here? Does this aero bar simply not work with my bike? I'm very annoyed at how much money I've spent on this bar (thinking it was reputable based on my research) and the time I've wasted trying to mount it. Please help! If I need to send this back I'll gladly do it, but would appreciate some advice on a replacement aero bar.

Thank you