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Proper trans fluid for '04 C4S numerous DE events

Transmission and Clutch

Model: C4S, Year:2004, Mileage:48,000, Type of use:Both Street & Track
2004 C4S used for numerous DE events. On a warm or hot day, by the afternoon, will start to feel the synchros downshifting into 3rd expecially. Does not do this except after track use on a warm or hot day.Would Mobil1 Delvac 75w90 be preferred in this situation, or is there a better choice?

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