I'll say no thank you to those 2 suggestions.   #1. Rush levi means it'll be heading into a heavy stream of guns. Ablative protects better than aphasic in both L1 and L2. Seeing as how no one uses giga, it's just L1, L2, L3. L2 being the most common (Trap&Pulse), followed by L1&L3 tied for second place (Pea&Beam Vs. Plasma&Posi). So I did some calcs myself using as reference, 2 trap, 1 beam, 1 plasma. Seems like a reasonable defence. Ablative took less damage than aphasic. Hence, I'll stick with ablative unless you pull out some real evidence.    #2. I will need all the speed+thrust I can get on my levi since I'll most likely get repped back multiple times. Carnot trumps Ion in that respect. Add to the fact that I won't be ab'ing on rush, meaning carnot's cons` mean nothing. Levi's basic rot is more than enough for me, and carnot provides +1. I won't need Ion's +3/4.