Railing - need a little help

[Matt_in_Brooklyn]

I finally finished my railings this morning. The problem is that one side is a little too wobbly for my liking. It's safe, just a little too much play in it. I'm looking for some suggestions to make it a little more rigid. It's firmly bolted to the wall and the newel is welded to a base-plate that is bolted down. I also have two 4" weld tabs bolted into the side wall with a couple of out-riggers. I thought they would be enough.

I was thinking of adding some gussets to the weld tabs to stiffen them a little or maybe adding a piece of 1/2" bar between the weld tab and the ground.

Any suggestions?
Matt.