Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Which way have you mounted your XP 90, I have the tubes at the top on my Asus P4C800-E. The HS will fit either way. The Thermalright's info is not very clear on how to mount it.
Mine is mounted so that the heatpipes face to the I/O plate and the extention that hangs over past the CPU is over my RAM. I found this was the easiest to mount, also make sure you secure the corners without the heatpipes first as said in the instructions manuel.