Too much fluctuations in RPM trend

We drill 6’’ hole at the depth of 6500 m. we are facing a lot of RPM fluctuations (80 – 110) goes to 110 and than drop to 80 with slightly change or near to constant torque limit to 10 KFT-LB. we have get same curve RPM trend even at low weight (3 – 4 tons) When we checked off btm Torque we have smooth curve of torque and RPM limit. This well have in slightly S shape with 2 side track. Formation is 100% shale. Please share your though how we minimize this issues. We use semi packed BHA.

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