I made two mistakes tonight. The first was starting a new run at midnight my time...bad decision. Thank goodness I have work off tomorrow or that decision could have been really costly.
The second mistake had to do partially with experimentation and partially with greed.
Lately, I've been able to purchase Terra 6 amps at ~106% MU. To me, they're a no-brainer at this price since they only cost ~1% more than d-class or L5 amps right now and they increase my cycle speed drastically. More importantly, I've been getting 7-20% weighted MU pretty consistently lately, so I had a pretty good feeling that I could breakeven or better with these.
Buying Terra 6 amps wasn't the mistake. Buying Terra 7 amps WAS.
Encouraged by my 20+% MU run today, I thought, "Why not increase the cycle speed even more and cash in on more markup?" However, I recognized two things while using four of these amps. First, consolidating 400 PED (the cost of the amp) into 40 drops versus working 360 PED into 56 drops (as with the Terra 6 amps) felt far more like gambling. Every drop, I was hoping for "the big one" to land. With Terra 6, I know that I can have a full run of normal-sized drops and come out just fine after MU...not so with Terra 7.
Second, and maybe more importantly, using Terra 7 ruined my loot comp :/
TL;DR - I wouldn't recommend using Terra 7 amps unless you feel like gambling. Then, I would recommend taking a cold shower until you don't feel like gambling anymore.
Run 56 - 4x T7 Amps
TT Cost - 1920
TT Return - 1499 (78.07% TT)
Weighted MU % - 5.13%