Stair Channel bottom toe in-compression

[Imagineer45]

I am doing work for an ironworker friend. We are building a cantilevered frame from 12"x10.6 (stair) channel. 4'0" wide, 22feet long centilever and 10'0" at counterbalance. We will have adequate concrete deadweight at back of 10 foot c'balance section (approx 10,000#) due to patio added to deadweight tied with rebar. There is a 1/2"x12"x4'0" vertical plate at the fulcrum. My concern is the compression in the bottom toe at the fulcrum. My SWAG is to add a 3/8x2"x10ft bar 10 feet both directions from the fulcrum. Is this adequate? Would I want to box the 4 channel legs instead? I do not normally work with structurals.