Using Uni-Strut but have flex in cantilevered shelving

[Prizen]

Hi All

I am using some Unistrut to for cantilevered shelving in my shed. I have on member bolted into concrete block, and then another piece 2ft long cantilevered out for shelving.

Problem is, I have a lot of flex on the members that coming out perpendicular from the wall.

Any thoughts on how to improve this? I am using L brackets that have two boltholes altogether,

 

[clogs]

there are diff grades of Unisrut...most just double it up...for a stonger section....
or if ur feeling spendy buy the extra deep section...
for anyone interested it makes good roller door section...proper made wheels etc all from the factory....