Unless you want everything to collapse under a pile of amendments and counter-motions, it's vital that the actual wording of your motion doesn't even mention the deficiencies of the Chairman. Get the list out of the way first, then propose your motion, using the simplest possible wording.
So you should start off by saying something like "I wish to draw the attention to the committee of the following failings of our Chairman:
1. At our meeting on 3rd April he agreed to put this committee's views before the local council but, at the following meeting, he admitted having failed to make any attempt to contact the council.
2. The Chairman then accepted an invitation to speak at a Council meeting on 26th May, in order to represent the views of this committee. But the minutes of that meeting show that the suggestions he put before the council were in complete contradiction to the minuted resolutions of this committee.
3 . . . . (and so on) . . ."
Once you've reached the end of your list, simply state; " . . consequently, I hereby propose the motion that this committee no longer has confidence in Mr Albert Smith to continue in his position as Chairman".
Many committees have Standing Orders which require that any such motion should (if it has been properly seconded) be voted upon immediately, without any further discussion. Even if your committee has no such rule, you should seek to ensure that no further business (including discussion of your 'list') is permitted until a vote has been taken.
Chris