The Highlander part has already been addressed. Apparently having fewer Phoenix Hawks is a bit of an illusion, as the FRR has two types, together largely equalling the single amount of St. Ives (and also being a product of a parent faction, I assumed that like the Combine its PHawks are a bit drowned out by all the Panthers and Jenners). As for Blackjacks, St. Ives, being a breakaway state, uses the availability given to its parent state, the CapCon, for its early existence. I also only covered it up until 3039, so there's not a lot of time for drift there. In 3039 Blackjack production has been ended for almost 150 years. As such, they have the same amount as the FedSuns (which TR 3039 says also has the most), and more than the other Houses. TR 3025 says production was cancelled after only a few years, and no source says it was common; thus, I made it overall uncommon, with the small spike in CC, FS, and St. Ives. What a RAT does isn't going to override that: they're sources of last resort, frequently contradicting hard sourcing like TRO entries; I only recall one time I used a RAT as a guide, and that was when I had no other information to go on (Succession War-era Flashman availability).
This conversation did cause me to realize that I'd missed the TR 3039 note that St. Ives was unable to afford to be choosy and so used Blackjacks in front-line units, despite the parent CapCon despising them. As such, I should remove the asterisk from the St. Ives deployment table. I also need to add the new old-school Longbow from the RecGuides, IIRC, so I'll likely put out a mini update soon.
Since I prefer Xotl to focus on writing stuff I hope to someday buy and updating the MUL, I'll try to address these.
While I did a decent amount of work on it at the very beginning, and occasionally make a very minor update if I see something reported in the errata thread, my work on MUL faction access nowadays is miniscule: people like Jan Prowell, nckestrel, and recently especially GreekFire and Sartris far outweighs anything I've ever done. But I appreciate the kind words (and I am pretty busy for the next few months, so my replies may be pretty slow for the next while and help like this is appreciated).
On a semi-related note... I've always wondered. Why the heck was this thread never stickied in all its years of existence?!? I'd have thought it'd at least belong somewhere in the Fan Designs and Rules section... :-\
It's unofficial, so really having it just being permitted here in GD is really quite a nice bonus.