this has to be a joke?!? are you serious using pavers to block your boat??? come on april fools...

Definitely chain them together.

The Instatims are a Bennet-esque trim tab. Not k-planes.

Your jackstands are a little far forward, there isn't much weight up in the bow and as long as nobody is going to be going into the boat while its on the stands (which they shouldn't) I would move them back to just slightly in front of the helm area.

No joke. Pavers have a higher pressure rating per square inch than cinder blocks do. What would make these solid pavers crack or crumble and a hollow cinder block not?

Ok I will move them back tonight when I get home... And no one will be in the boat.

This is way scary!Please do not work under that boat with the current set-up.
Notice the adjustable stands in front.Built with a wide base.
Use cinder blocks,4x4's,or even pavers,but start with a wide base at the ground and work your way up like a pyramid.

Should I add more support under the keel? How can I go about changing it now?

I think for a driveway job you did great. As long as all the weight is on the keel the stands and blocks should only be used to balance the vessel.

That is exactly how it is setup. On the last step before completely pulling the trailer, I made the stern float a little, then adjusted the forward most keel stand to put some pressure on the stern blocks for balance. 75% of the weight I would say is on the keel, with the other being shared by the stern blocks probably 20%, and front boat stands probably about 5%

[QUOTE=SmurfOnAGixxer;2859208]Should I add more support under the keel? How can I go about changing it now?[/QUOTE

Keel support looks fine.I think you need more rigid supports under the aft corners.

The issue with the pavers isn't that they are unable to support the load, it is that you have a single stack. Would be relatively easy to kick the middle of the stack out and then down goes your boat. I.E. that kids game, Jenga I think it is?