It's normal, also for my CT, that if you do not use a Electrical fuel pump you will have a slight PSI loss doing full power T/O. 2,6psi is no issue according to Rotax. If you do not have a Electrical fuel pump installed - you could consider this for extra safety.
Do you lose Power doing climb at 2,6psi?
The hoses are not orange, that is the fire protective sleeve on top. The hose is below. These are usually from Rotax and would not course a fuel supply issue, usually.
In my situation it was press fittings that was not from Rotax. They were longer than the Banjo bolt that they were pressed on too and caused the hose to be pressed closed.