There is no need for a fix on this since it is working as intended. The 26-27 schematics were never sold from a vendor, so same way if you want better schematics you need to reverse a 30-31 mod. This is on par with the old 400 schematics from vendor where you only got the A ones as well.
So in no way should we receive a schematic from trainer that is better than the ones you get from reversing a drop, even if it is a 27 one.
More, are the As schematics so bad for companions? No, you are just using this as an excuse to cry for better recipes for no trouble. If your companions is already equipped with 27s BIS then you need to use drops or 30-31 crafts. Again like it used to work pre 2.0.
Last, if you compare the other crew skills you will notice that they get the best 28 schematic available (like hilt, barrel, enhancement etc) but so does Cyber with Armorings. Giving cyber the best for mods as well would just make an op profession even more op (mind you i already have all crew skills so i wouldn't' mind receiving such a buff but it would cause more balance issues)