On a number basis, I would not expect that the gravity on a shelf stable wine to change.
Sweet taste will depend on what was eaten prior to the sample. If you stage high sugar foods this over sweet one could feel proper. Another trick could be to sprinkle acid blend in the glass to balance the sweetness feel. ,,, If you are close to optimum you are good enough! I have seen that a bench trial will have different “best” taste if you resample several times over a 24 hour period.
Sweet is a personal preference, many folks in the vinters club will pick a best balanced which is dryer than my wife or kids would.