I think there's an issue in the fact that your racial proficiency stays permanetly as "trained" and doesn't advances alongside your "normal" class weapon proficiency.
As an example, an elf rogue will be trained at longbow, but suddenly, at level 13, he will become expert at shortbow but not with the longbow that he was using for the previous 12 levels.
This is strictly because Weapon Familiarity is worded really, really bad.
"become trained in x,y,z. "Race" martial weapons (a,b,c) count as simple, yadda, yadda, yadda"
Thing is, x,y,z and a,b,c are different. That is because "race traits" on weapons exist.
So, elven curved blade, has the "elf" trait. The longbow, doesn't. So, going by traits, longbow isn't an "elf" weapon (regardless if it's under the "weapon familiarity (elf) feat), it's still the same martial weapon it always was, you're just trained in it.
Simplest solution would be the inclusion of the actual racial trait on weapons under the respective weapon familiarity feat.
so:
bows, rapier, short/longswords gaining the elf trait
battleaxes, picks, warhammers gaining the dwarf trait
galive, kukris gaining the gnome trait
and etc for all races.
since all martial classes that increse weapon proficency always increase it for simple weapons as well, this will allow "racial" weapons to be advanced per normal as well.
