A-rate your limpets, fit a Pulse Wave Analyser, get rid of one of your lasers and fit both SSDM and SCL then practice
There is more to mining than just getting the best priced material or hunting for the best selling price, sometimes a lower priced commodity can be mined and sold faster and earn more and some can be allowed to accumulate for sale at a later date.
Icy rings can be good earners, Bromellite sells well and is fast to mine, on the side you will get LTD's, Tritium and Methanol Monohydrate Crystals (MMC's). both Brom and MMC's are wanted on mission boards and both can be sold for better than market prices to other carriers or sold from your own carrier.
Cores and SSD's can be well worth mining, I do not often go specifically for them but I regularly scan with the PWA when laser mining and do them as I go.