The sharpening of sweetFX is resolution dependant because sweetfx is post processing meaning that it will work from the image produced by the graphic card, this same image change from the resolution used.
If your computer handle it, prefer 1080p in game resolution and 1.5 supersampling in game. If your comp can't handle you "downgrade" your settings with 1440p (DSR nvidia panel) resolution and 1 supersampling. If your computer still can't handle it then you simply use 1080p (native res of rift) and 1 supersampling in game.
I have limited english skills (not native language), hope it helps you.
Your English is fine, you were just being a little terse and ninja
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