Hi, Just recently installed my 50" panasonic onto the wall, after reading these forums of install ideas and what to use i opted for 4 projecting m10*135 anchor bolts. But when i tried to tighten the bolts to the bracket they just pulled out of the breeze blocks

Not anchoring themselves at all!!! So i opted for 8 m8*100mm coach bolts, these go straight through the plaster and into the plugs that are firmly mounted in the blocks.
The bracket is solid and when the screen was placed against the wall its also solid and im quite confident that it will hold. But on returning to work today i told one of the guys how i mounted it and he seems to think that they are not adequate enough, my worries now are that when i return home( which is in ten days time) i will find a nice hole in my wall and a smashed plasma on the floor!
What do you guys think? should i have opted for larger bolts or is that really overkill? Its a 50pz70 by the way, anyone else just mounted using coach bolts into breeze blocks?
thanks