So, here is a situation I found myself in this weekend and I'd like to know what you would have done.

I made a 3 tier wedding cake.  Bottom, 16", middle 12"  and top tier, 6". 

The bride wanted the 7" "crystal" look pillars.  She wanted the cake tall and elegant!  It was tall alright!

Everything was going just great until I arrived with the cake at the reception hall and started putting it all together.  I completely expected that cake to topple.  I felt like it was VERY unstable.   What can be done next time so I can walk away more confident that the cake will be ok? 

Just for the record, it didn't fall, but I have to tell you, I'm surprised! 

Looks good.  I would have cut the internal supports shorter eliminating the gap between cake and plate for more of a "suction" rather than balancing act, and would have used a base board rather than plate.  (Also would have used matching crystal-look plates instead of white.)

Gorgeous looking cake.  I think I would have found 9" push in pillars and told the bride that's as high as you dared to go.  The cake that you pushed the pillars into would be your support.  But in your case the only thing you can do is add more sturdy supports under the plates to prevent tipping.  Honestly, there's always something new to learn with each delivery.  It simply amazes me.

Gorgeous looking cake.  I think I would have found 9" push in pillars and told the bride that's as high as you dared to go.  The cake that you pushed the pillars into would be your support.  But in your case the only thing you can do is add more sturdy supports under the plates to prevent tipping.  Honestly, there's always something new to learn with each delivery.  It simply amazes me.

Gorgeous looking cake.  I think I would have found 9" push in pillars and told the bride that's as high as you dared to go.  The cake that you pushed the pillars into would be your support.  But in your case the only thing you can do is add more sturdy supports under the plates to prevent tipping.  Honestly, there's always something new to learn with each delivery.  It simply amazes me.

Gorgeous looking cake.  I think I would have found 9" push in pillars and told the bride that's as high as you dared to go.  The cake that you pushed the pillars into would be your support.  But in your case the only thing you can do is add more sturdy supports under the plates to prevent tipping.  Honestly, there's always something new to learn with each delivery.  It simply amazes me.

Gorgeous looking cake.  I think I would have found 9" push in pillars and told the bride that's as high as you dared to go.  The cake that you pushed the pillars into would be your support.  But in your case the only thing you can do is add more sturdy supports under the plates to prevent tipping.  Honestly, there's always something new to learn with each delivery.  It simply amazes me.

Gorgeous looking cake.  I think I would have found 9" push in pillars and told the bride that's as high as you dared to go.  The cake that you pushed the pillars into would be your support.  But in your case the only thing you can do is add more sturdy supports under the plates to prevent tipping.  Honestly, there's always something new to learn with each delivery.  It simply amazes me.