I also had trouble installing the VRSF charge pipe onto the throttle body. I tried oil but it didn't help. I read silicon grease would help so I went to home depot and got silicon grease in the faucet section spread some on the o-ring and all over the throttle body connection and it worked. Here is what I used:
https://www.homedepot.com/p/DANCO-0-...8693/203193536