When installing carbon or fiberglass blades in footpockets, it's important that the blades go as deep as possible into the slot. If the blade doesn't go all the way in, there will be less support from the footpocket, and the blade angle may not line up with the footpocket angle. For this reason I take one of each footpocket, cut out the bottom exposing the slot, and make a template. I use these templates to reshape the back edge of Speardiver carbon blades if necessary, for optimal fit inside the footpockets. It's not difficult to reduce carbon and fiberglass with a belt sander, or a Dremel for finer details, once you have a feel for the material and the tools. I'm sure you'd be amazed if you could see inside footpockets, at how poorly blades from some manufacturers fit.
When the slot shape is something ridiculous like the Salvimar footpockets, I don't use them.
Here's a template with a carbon blade reshaped to match.
This is a Speardiver C90 blade ready to install in an omer Millenium footpocket.
These omer Millenium footpockets were brought to me with a broken Ice blade. I was going to keep the plastic blade to use instead of a paper template until I checked the fit. I was surprised to see that the original omer blade wasn't made to fit all the way back inside the footpocket. 0.5" probably doesn't make a discernable difference, but I can't help noticing these details.