Hi
Besides all suggestions that partners already give you, I will recommend to check mold temperature during your trials, not just the reading in the MTC display, also check real temperature in cavity and cores, to ensure you are using same conditions on cooling temperature every trial , other wise you could get different results,
try to use the correct hopper/ dryer size, dry the amount of resin that you will use according to shot size its important .

we had a similar issue, not exactly same, but some issue with PA resin, we has been receiving the resin in Gaylord of 1500lbs, material handler open the Gaylord and full the dryer of resin ,, the parts appearance has variations between each running also some dimensions, we request to resin supplier to change the resin packing from Gaylord of 1500lbs to a 25kg pre dryed bags, after that we control the hopper size and our issues was solved, by the way you can find the application "calculation tools" make by Suhas in playstore, you can download for free and you can make different calculations (clamping force, hopper dryer size, shot size estimator, water flow etc.. its nice tool
regards