Great bot as always cuppa!
A setting allowing you to customise the number of chiseled fragments at the start would be a welcome addition.
At the moment, if you use 'mine until X essence at game start', I believe it attempts to make enough essence to fill your pouch and invent. At 85rc there isn't enough time to chisel a full invent and craft runes before having to prioritise mining at the portal. With the current level of customisation you're essentially locked in to waiting until the first portal to avoid mining at the 1st huge remains with a partially filled invent of essence.
If you had the option of mining 170-200 fragments and creating ~30 essence only, it would increase the efficiency by allowing you to craft before the first portal spawns.