Fuel Pressure spread

Hello all!   First time posting here, long time forum stalker!   I've recently installed a Raptor FRRP to replaced my failed carter. Not sure how long that one was out but I found out while in the process of installing my ISSPRO gauges.   Right now once the truck is fully warmed up my fuel pressure is at 19psi sometimes falling just into 20psi. While running down the road my numbers are between 16-18psi depending on hard heavy the left foot is. At WOT I get 14psi, sometimes dipping down
Well here's my new setup!       Pretty straight forward install, pretty much followed the install from the article that's already here.   Some things I learned... - When using these type of hose connectors, dont over tighten! Luckily I had one extra otherwise I would have had to make another trip to NAPA - I'd assume if you were installing this your gauge would be out of the cluster like mine was, so once all your plumbing is good, place your gauge   facing the front of the truck, t