What grade are you gathering at, if its 4 I would check if you can get them at grade 5s, I know when mining Nophicas wells (grade 4) has a terrible electrum ore rate even at the sweet spot, but Halatali (grade 5) is alot better.

To gather grade 5s at a decent rate you may need to do some lvling but some lvl 40 leves will lvl you in no time.