I recently decided to take up pottery, and was concerned about the skill-up level. Specifically, I did exaclty 100 combines (2 clay and 1 urn mold = urn, triv 28) at a skill level of 20 and only had 4 skill-ups, to a current pottery skill of 24. Thats a rate of 1 skill-up per 25 combines. This seems a bit low, as with my other tradeskills (tailoring, brewing and blacksmithing) I generally receive 1 skill-up for every 5 to 8 combines. Is this intentional or an oversight?