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Absolutely. Never too late to help with PID tuning.

Another interesting one... PID myPID(&Input, &Output, &Setpoint, 64, 4.5, 1, DIRECT);

I am not certain why you've set your Initial Integral Gain so high. Perhaps the documentation missed a decimal place or something. You'll cook you coils in no time with that setting. Try setting it to a more reasonable setting like... PID myPID(&Input, &Output, &Setpoint, 24, 8.3, 20, DIRECT)...