Adjust weekly gear and tome limits from per player to per role.

[Banggugyangu]

The simple(st) solution is just raise the cap to 900 a week. It doubles how quickly you can purchase gear for all the jobs, but also lets you accelerate gear even if just doing one job. Instead of capping one week, then rushing to cap a second week for your chest or pants, you can just do the one week and get your piece. Assuming a person is just buying tome gear, and only tome gear (due to not Savage raiding, blah blah what-have-you) costs 4,635 tomes. Even with a cap of 900 a week, you are still dedicating 5.15 weeks to a single set (Fending/Healing/Casting you get it). So if you kept that pace for the 7 sets that exist and the caveat of 5 sets of accessories, that's just over 32 weeks or 8 months, which is close to an entire raid cycle.

EDIT: Decided it would be beneficial to put the math and costs here, in case someone takes issue with the numbers.

Head/Hands/Feet are 495 at 1485 (3 pieces)
Body/Legs are 825 at 1650 (2 pieces)
Accessories are 375 at 1500 (4 pieces)

If you're not raiding, then the tome gear is quite superfluous. Penta-melded crafted gear will outdo non-upgraded non-BiS pieces of tome gear, and that can be obtained at the rate of gil. For savage raiders, you can BiS 2-3 roles in a raid cycle pretty easily, depending on whether or not the role is primarily savage gear for BiS. The big outlier is the tome weapon, and arguably one could say "Just get the savage weapon" which is better anyway, sure, but some people doing PF have terrible luck with lots. This is why I say that the normal cap, for the most part, is fine. Giving a post-cap special tomestone that's only useable on the weapon offsets the big outlier.

[ShiroeTengoku]

If you're not raiding, then the tome gear is quite superfluous. Penta-melded crafted gear will outdo non-upgraded non-BiS pieces of tome gear, and that can be obtained at the rate of gil. For savage raiders, you can BiS 2-3 roles in a raid cycle pretty easily, depending on whether or not the role is primarily savage gear for BiS. The big outlier is the tome weapon, and arguably one could say "Just get the savage weapon" which is better anyway, sure, but some people doing PF have terrible luck with lots. This is why I say that the normal cap, for the most part, is fine. Giving a post-cap special tomestone that's only useable on the weapon offsets the big outlier.

I do Savage raid, and I can typically get just about every single set to BiS before the next tier comes out. I stated in my post if a person is only buying tome gear, due to not everyone grinding in some facet. The tome weapon is always an anomaly, as it takes a lot of time to get one, and usually barely worth the purchase. Either way, the 450 cap only works well if people are Savage raiding to offset what they need to spend. There's very little reason to keep it at 450 a week, except for the defense of, "Its always been that way." or possibly, "It's to keep people subscribed." despite the FFXIV team have stated and shown, multiple times, they value players' time.

[Banggugyangu]

I do Savage raid, and I can typically get just about every single set to BiS before the next tier comes out. I stated in my post if a person is only buying tome gear, due to not everyone grinding in some facet. The tome weapon is always an anomaly, as it takes a lot of time to get one, and usually barely worth the purchase. Either way, the 450 cap only works well if people are Savage raiding to offset what they need to spend. There's very little reason to keep it at 450 a week, except for the defense of, "Its always been that way." or possibly, "It's to keep people subscribed." despite the FFXIV team have stated and shown, multiple times, they value players' time.

Again... if someone is not doing savage raiding, then the tome gear is totally superfluous... Whether or not YOU are doing it is irrelevant. The "you're" in my original statement wasn't directed at you, specifically.