Yes try shimming needles to see if it improves, or gets worse. This would be useful data. Also do you have access to wideband-O2 with datalogging?
Oil-pressure relief valve may be clogged. Search for oil-pressure mod with shimming spring for slightly higher oil-pressure.
I had issue on my track bike with oil-pressure light always coming on 15-minutes into each and every session. Tried all sorts of different oil brands and weights. Finally found Motorex was only stuff that worked at track.
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