No observable overload on the Step with the Star system, it uses a tube-within-tube system and the internal alloy is more bendy at the tops to allow air to spill before it overloads the mast step. As you know, its up to the Skipper to Furl some sail if the wind is strong before it reaches design strength overload. Roadrunner, I think, said that the 22 SqFt stock sail was made small-ish partly because it was easier for neophytes to handle.
2.5M2 is a good size for the Oasis.
Like you, I need more area for light conditions, and this design has a real Aerofoil cut in maintaining its shape up to 50% furled.
The stock Hobie sail has a constant Chord from foot to tops.
I only bought my Star sail 'cos the Hobie dealers are all out of the stock ones for a month here and IMO it was positive happenstance.
Star have Decades of experience making sails and endless customer support, same price as the Hobie rig.
Scroll down on this page for pics of my Star setup on the Revo 15/16
https://www.facebook.com/PlywoodPirates