Raise the levels of the monsters so all are equal. Right now you have three to four leves with starting rank of 45 and then the rest with rank 40 (Rank 40 leves) which is why DFD gives so much more SP. Increase the number of optional monsters for the leves to ensure all leves give a good amount of SP. And please lower the number of necessary leve links to increase SP. Normalize SP so that it is like "maximum" link if at least two links would be perfect. Increase the gil total from rank 40 leves... Gil sellers don't farm rank 40s, they farm rank 10s because it is the SAME gil as some of the rank 40s... How silly is that!