Its surprising just how much loading a screen will get from the wind.
Mine is semi homemade, consisting of a cut down proprietary screen mounted to the top yoke on curved blades which I fashioned from 2mm thick aluminium alloy.
The screen is shorter than the std ones fitted to early monsters so the leverage is less.
Despite the ally blades being quite wide (maybe 30 to 40 mm) and looking like they were easily beefy enough for the job, after about 10yrs in service and much to my surprise, one of them snapped clean in half last year.
If the std screens deflect that much in the wind I'm surprised that more of those don't fail.
So I reckon you've done a good little mod there, Nick.
Capo has a couple of similar struts on his S4R that we made between us, using carbon fibre tube and homemade ally end pieces.