I'm close to being done building up a frame and just installed the FD with new shift cable.
I currently have an Ultegra 6503 FD and 105 triple brifters.

Now when I try to get the bigger chainrings, I get two clicks to move it to the middle chainring. When I shift some more, I can only get it to click only once more and is not enough to get it to the big chainring. I've been playing with the cables and still no luck.
I've also checked the outer limit screws and it's not it.

All of the drivetrain components are coming from another frame. The chainstay length are a bit different. I'm coming from a 415mm -->418mm. is that a significant difference?

Also I noticed that when it did go to the big chainring and pedaled with my hands, I heard some rubbing noises coming from the rear wheel/RD. I don't hear it when the chain is in the granny or middle ring.
Is this also stemming from the chain length?

Thanks!