As above, the only time this happens with me is if I have entered the email addy incorrectly.
However some of the IT gurus on here may have a more technical fix.
You will be fine with the Carbotech XP8.
I would run them with the OEM rotors and see how you go.
Your XP8s with oem rotors will solve your current issue.
However braided lines and proper fluid will help with other potential issues.
Perhaps upgrade your rotors at a later date if you become a track day warrior.
No special tools required and ok for daily use,
Read the compound chart on the previous link that I put up.
Alex.
Carbotech is the way to go.
However, select your compound with care and marry up to a non to aggressive rotor and you will be fine.
I run Carbotech on my track R35, 10 on rear and 12 on front.
An 8 would be my starting point with a stock 370.
All suspension arms in stock. and all ball joints also in stock.
Just to be clear please confirm what arm / ball joint you require as your description is a bit unclear as there is not an upper control arm with a removable ball joint.
Alex.
What Sam has said: ^^^^^
Your main serpentine belt is one rib out.
Slacken off the tensioner and refit the belt in the proper position.
Extremely poor quality of workmanship.