Ho to solve Servo and software serial conflict?

Hey guys!

Im following the instruction how to solve the problem according to :

http://tutorial.cytron.com.my/2015/09/04/softwareserial-conflicting-with-servo-interrupt/

However, my servo is still slightly shake and receive data becomes slower.

Im doing a project to communicate between  arduino boards via Bluetooth HC-05 . I want to control servo by potentiometer via Bluetooth.

+Master ( Uno board) connects with potentiometer  and then Master sends data to Slaver.

+Slaver ( Mega board) connects with servo and control servo whenever it receives the data from slaver.

+ In my slaver, I wire bluetooth Rx pin and Tx pin to  Pin 10 and Pin 11 of Mega respectively.

Can anyone help me to solve the problem

Sincere thanks in advance