You might try taking a glance at the first couple of responses by DevilinPixy in this thread: Post 1.38 Missing Blue Prints. These covered all of your missing blueprints.
The missing pulse splitter and boltcaster blueprints can eventually be found from blueprint traders. I had those until I had a bad windoze 10 update forcing me to restore from an image. Unfortunately did not have a backup of the save where I had gotten those and a couple of other final blueprints so am hitting a lot of Gek systems to hopefully find those again as well as the freighter warp blueprint. The boltcaster blueprints are found with Vy’keen blueprint traders. Have hit an additional 148 Gek systems so far with no luck. I recall that once I found one of the final missing blueprints the rest came along very quickly and I had nine missing blueprints to find not including the ones that are not available or the decals. Can get by without these but just want them for completeness.
Good Luck