hi, i made pid tuning for the extruder
SENDING:M303 E0 S200 C8
// bias:108 d:108 Ku: 21.402323 Tu:36.000000
// Kp: 12.841393 Ki:0.713411 Kd:57.786270
// bias:108 d:108 Ku: 20.993881 Tu:36.806000
// Kp: 12.596329 Ki:0.684471 Kd:57.952560
// bias:109 d:109 Ku: 21.188269 Tu:36.405998
// Kp: 12.712961 Ki:0.698399 Kd:57.853504
// bias:109 d:109 Ku: 21.433683 Tu:36.006001
// Kp: 12.860210 Ki:0.714337 Kd:57.880592
// bias:107 d:107 Ku: 21.454586 Tu:36.006001
// Kp: 12.872751 Ki:0.715034 Kd:57.937035
//PID Autotune finished!
ok N:9
>>> M301 P12.87 I0.72 D57.93
SENDING:M301 P12.87 I0.72 D57.93
//orig:P:12.872751 I:0.715034 D:57.937035
//current:P:12.870000 I:0.720000 D:57.929996
ok N:9
>>> M500
SENDING:M500
ok N:9

but the temperature still not stable with fluctuations of +/-5 grades

How can i fix?