Overhead Garage Storage

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I think the OP wanted a storage shelf not a full time job flipping boards.

You're right on tract with the pessimism, next will be the 25pgs of guesses and inaccurate assurances.
 
Here is a way to eliminate sagging and not have to keep unloading your shelves and flipping the boards over until they reach Snoonyb's level of dryness.

Take a 2x4 and cut it to fit between the unistrut. Screw it to one of the 2x6's (after flipping it) to form an L shape. Do this to several of the 2x6's and lay them out 16" (or possibly 24" OC). Lay your plywood across the top of the 2x6/2x4 combos and screw it down. You won't lose any headroom as the 2x4 wouldn't go below the unistrut level and wouldn't raise the level higher than it is today. The 2x6's are laying on their weak axis, adding a perpendicular 2x4 will strengthen the structure and prevent sagging.
 
Here is a way to eliminate sagging and not have to keep unloading your shelves and flipping the boards over until they reach Snoonyb's level of dryness.

Take a 2x4 and cut it to fit between the unistrut. Screw it to one of the 2x6's (after flipping it) to form an L shape. Do this to several of the 2x6's and lay them out 16" (or possibly 24" OC). Lay your plywood across the top of the 2x6/2x4 combos and screw it down. You won't lose any headroom as the 2x4 wouldn't go below the unistrut level and wouldn't raise the level higher than it is today. The 2x6's are laying on their weak axis, adding a perpendicular 2x4 will strengthen the structure and prevent sagging.

Since the OP has referred to 2X10's, while you have used 2X6's, you might ask which unistrut was employed, the 13/16" product or the 1-5/8" product, and then inform him where he can find the 2" product, so that, "as the 2x4 wouldn't go below the unistrut", can achieved.
 
In reviewing the pictures he has the room for a 2x4 installed vertically and flush with the top of the unistrut.

The 2x10's will continue to sag as he flips them over for several years until they reach the level of dryness you are looking for. There are other ways to accomplish it, the 2x4 solution I mentioned has the benefit of using materials on hand. Using angle iron like the garage door tracks are hung with would stiffen it, but would require an expense and a trip to the home center.
 
In reviewing the pictures he has the room for a 2x4 installed vertically and flush with the top of the unistrut.

So, 1-5/8" unistrut + 1-1/2" 2X10, equals the width of an 3-1/2" 2X?????

The 2x10's will continue to sag as he flips them over for several years until they reach the level of dryness you are looking for.

Well, why didn't you say you were the OP's neighbor and reside in a dwelling identical to his with the same sun orientation and simultaneously activated garage door openers, and you verify with each other before entering the garage through the pedestrian door, so you have the ability to perfectly access the rate of drying of wood members.
 
So, 1-5/8" unistrut + 1-1/2" 2X10, equals the width of an 3-1/2" 2X?????



Well, why didn't you say you were the OP's neighbor and reside in a dwelling identical to his with the same sun orientation and simultaneously activated garage door openers, and you verify with each other before entering the garage through the pedestrian door, so you have the ability to perfectly access the rate of drying of wood members.

Perhaps he looked at photos and extrapolated some measurements from things he can see and measurements are known.
 
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