I find the similar. But I am using a shieldless 784t cutter in a good security system, interdictions very rare. Most of the large quantity commodities need to come from surface settlements. Some orbital stations have smaller quantities, but if someone else is taking them too, they get depleted quick. CMM Composite, Steel, Aluminum, Titanium.My construction pad is 3.8 kls from the colony star. My target supply station is 37.6 ly away. The CMM Composites are at a surface station 191 ls from the main star. Using SCO boosts, no loops of shame, I am getting a loop transit time of 13 minutes and 33 seconds. So that is 4.5 trips per hour for a total of 2918 tons per hour. The construction pad is in a ice ring.
I find the ultimate worst for time is sourcing from surface settlement (dark side) to destination surface settlement (dark side) and also having to travel around the planet for jumping to other system. I try to minimize these situations but often necessary by switching to other sourcing systems.
In the past I tried using the FC as go-between, but I found it was more hassle than it was worth. Often it was on the wrong side of whatever planet I parked it at. Perhaps parking it at the sun would be better. Anyway I find it faster & easier to just go direct.