increase drop materials by level
it’s disastrous farmit materials for t4 rawhide iron chunk and veiled crystal fall terribly low and I think that they should fall in high honors on such a difficulty because if a person wants to masterwork something, it will happen to him that he will be overwhelmed by the materials I mentioned drops and then getting them again is quite difficult because they drop in small quantities and when we use opal for materials, it gives us a boost of 2 extra materials +/- which is not enough 
Just play more and dont spend your mats on not good items. Those mats i have above 50k so nothing wrong with that. Use opals very easy