You are not given new schematics as you level up I can confirm that but I am not sure if the recipe's you get are scaled by your level. I receive tier 2 superb recipes when I took warrior schematics perk.
Also I first killed my dragon at level 12 and that was before I unlocked Focus abilities, it was Fereldan Frostback in hinterlands and possibly the most trouble I had, now I have killed all 10 dragons and they come easy but my inquisitor is level 23 
Also inquisition perks aren't limited, my inquisition level is 15 and I am half way through to level 16. Mind you I haven't completed main story yet but completed almost every region, collected all shards, killed all dragons, unlocked all astriums etc.
Also dragon's don't give recipes, atleast not reliable ones, they do give Tier 4 crafting materials (the highest and only possible way) and purple weapons and armor.