I'm not a fan of any of them. I'm quite new, so take my input with a grain of salt. Here are my thoughts.
If you had thought any of them were strong, you wouldn't have to ask. So your question is essentially, which one is the least weak.
I think HerbsHQ is the least weak. I think HerbHQ would be stronger, but still not great. DrLeafy comes in second. I am not a proponent of names where you'd have to clarify "You know, Dr., like D-R and not D-O-C-T-O-R". Leafy isn't a word. DrLeaf would have been stronger.
I think those who are offering their honest feedback regarding the weakness of the names are doing so only to temper any overly-optimistic expectations, with good intentions. These names aren't very strong, but if you are an experienced developer and marketer you might be onto something. I hope you get what you're seeking to get out of the experience.