For loot distribution try something like this:
A = Basic mat’s , B = Ship BPC’s, C = Module/Ammo BPC’s, D = Mutaplasmid.
c1: A = 0.2X Resource’s, B = 0.5% chance, C = 1%, D = 10% chance to drop 1.
c2: A = 0.6X Resource’s, B = 1% chance, C = 2%, D = 25% chance to drop 1.
c3: A = 1X Resource’s, B = 2% chance, C = 5%, D = 50% chance to drop 1.
c4: A = 2X Resource’s, B = 5% chance,C = 10%, D = 100% chance to drop 1, 50% chance to drop 2.
c5: A = 5x Resource’s, B = 10% chance, C = 15%, D = 100% chance to drop 3, 50% chance to drop 5.
Then attempting 5’s in an expensive ship is worth the risk, since the market price will be based off of c3. Actually like the idea of an almost impossible mode that is extremely rewarding :] but It should be stated as such then. “Try at your own risk but be rewarded like a king if you some how succeed!” 
Let’s say someone run’s 3’s for 4 hour’s at 50% drop chance and 20 min per run, that’s 1.5 muta’s an hour 6 muta’s in a farming period. If the people farming them don’t use them they will probably sell them for about 20mil per so they can make around 50mil an hour.
If you need 8 muta’s to roll one semi decent mod with a slight improvement that would value that mod from t2 at about 160mil 2x-3x that of faction, but you have a chance of getting a really epic mod so it’s worth the higher price, seem’s like a decent drop rate.
That would put C4 farming close to 100mil/hour and C5 at 250/hour which is pretty damn decent for the risk that you take, so 2 hour’s, 6 run’s risking a t2 fit HAC costing 500mil to pay it off again. Or 18 run’s to pay off bling’ed + implant’s.