I woudl try increasing the air gap first then adjust the compression shims. (because changing the air gap is very easy)
Unless changing oil is a known, good mod specifically for the sachs forks (which i doubt) do not change the oil viscosity. The same oil controls compression and rebound so a lighter oil will reduce compression but also rebound. The Marzocchis have an issue where too little rebound feels like too much compression - the sachs may be similar so would not advise an oil change, you will not know what's wrong and nothing will be stock anymore.
I adjusted my compression shim stack by I would guess making it 50% more flexible and the results were brilliant (all be it with possibly wrong springs) I was looking for better performance in areas you mention.
Since I don't know what the stock compression shim stack is for the Sachs I can't really suggest one - removing one of the shims will help but may not have enough effect depending on how many shims are there to start with?
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'05 Gas Gas 300
'97 Aprilia Pegaso 650
'99 KTM 200
'95 ish XR630 (died many times in Oz)
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