This CG is an interesting one. Grain is available nearby in huge quantities at nearby orbital stations. Synthetic reagents are further (>60ly for good sources) and only at planetary bases.Sorry for getting off-topic here, but why is everyone with a normal hair colour hauling grain, when synthetic reagents give MUCH more profit (about 7k/tonne)? Synthetic Reagents are part of the II as well?
I am afraid I'm missing something very obvious here...
The choices are therefore:-
1. Carry vast quantities of grain very quickly to boost the CG tier and get a good percentage rating.
2. Go for synthetics, taking longer for each trip but making profit on the trips; maybe less payout at the end of the CG.
I'm going the synthetics route as the gameplay is then less repetitive and I think the per-trip profits (5M each trip in a T9) will outweigh what I might lose by coming in at a lower percentage on the CG. But if I was intent on being in the top 10% or top 10, that would be the wrong strategy.