SOURCE: i have a dyson DC18 slim all floors i have no
I realize this questioned was posted >1 year ago, but in the event you still have the poor suction/wheezing or if anyone else has this issue, here's what worked for us.
Use a plumbers sink snake to unclog the "pipe". I thought it was the pipe on the right hand side (when you're looking at it) which needed to be unplugged. There was a little in that size, however we retrieved the nastiest "hairball" out of the left hand side (when you're looking at it) and after removing that, and re-testing, the suction was incredible. In addition, the "wheezing" noise was no longer there.
Good luck
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