It’s likely inconsistencies with the servos you are using - the pulse range might be slightly different. Not easy to fix - you’d need to change the Phoenix code itself.
You can check this if you have a spare servo (or can remove just one), and see where the servo travels to when it receives a 500us pulse (should be -90 degrees) and then again at 2500us (should be +90 degrees).
Thanks you very much
Xavier
I have doubt on my 18 servo model: towerpro mg995
Because it is poor quality.
I want to replace by hitec modEl.
Can i use 18 hitec 485 on my phoenix hexapod ?
For me 645 model is too expensive 
Thanks you
Xavier
You should use the 645 at the shoulder, and you can save a bit by using 6x 422 and the six others can be the 485:
robotshop.com/en/hitec-hs422 … motor.html
The shoulder really needs the torque.
robotshop.com/en/combo-pack- … horns.html
robotshop.com/en/hitec-hs-48 … motor.html
The metal servo horns are very useful:
robotshop.com/en/hitec-splin … apped.html
Thanks you for advices 
Xavuer
The "shoulder " is Servo for horizontal movement ?
Xavier
There are two servos in the “shoulder”. Nomenclature is based on human legs: Tibia is between the ankle and knee, femur is between the knee and pelvis.
On Lynxmotion, we use the terms Left / Right and “Knee” / “Vertical” / “Horizontal”.
Sorry i don’t understand because you said in previous mail:
You should use the 645 at the shoulder, and you can save a bit by using 6x 422 and the six others can be the 485
There is 18 servos in hexapod so
6x 645
6x 422
6x 485
Please could you tell me where is "place"these servos?
6 are for horizontal movement
And 12 for vertical movement
On Website if i remenber Well it is written "6x hitec 645 " for horizontal movement
Thanks for your help
Xavier
645MG - vertical part of the shoulder (lifting the weight)
422HB - horizontal part of the shoulder (forward and backward motion)
485HB - knee
Thanks you vers much for your precious help
Best regards
Xavier
Hello
I bought official ps2 controller on your website to replace my broken ps2 contrôler from mhobbies.com
With “your” controler my Phoenix is walking but reversed.i mean front becomes rear Left becomes right
My hexapod is wired as on picture attached, for information i am not using Level shifter Received cause it doesn’t work (ticket opened) but i don’t think it will make my hexapod “reversed”
Thanks you
Xavier
If that’s the case, then you might want to reverse some of the brackets (especially those used to make the body)
Ok i Will change position of servo connectors
Thanks you
Xavier