Getting more out of LW...

Crafting is tied to the daily cooldown and work orders. That means, even at 700 skill, you can only get 22 Burnished Leather per day:
10 from the daily cd  (scales up from 4 at level 1)
6 from work orders
6 bonus from your follower working in the Tannery

But the garrison really does supply everything you need these days, and the 6.1 'visitors' can help massively. 
Keeping a Barn fully stocked, with a worker, produces masses of leather so there are plenty left over and this is where the visitors come in.

Exchange 50 leather for 25 Primal Spirits with a daily quest
Use 10 leather plus 1 Primal Spirit to skip the daily cd and produce 1 Burnished Leather.
If you have the whole 300 raw leather available, that means an extra 25 Burnished Leather every time Jake the Fox comes to see you.

I had to do some extra skinning to reach the whole 300 the first time but the Barn soon kicks in and takes over.

You can take it further though...
There is a different visitor every day with a daily quest to convert 50 base material into 25 Primal Spirits.
Herb Garden easily supplies enough herbs if you pick daily
Mine supplies the ore
Salvage Crates supply enough greens to DE for Dust - you can easily find someone with an Enchanter's Study via Groupfinder

So, using the groupfinder, you can find one of the traders every day and make another 25 Primal Spirits.
The Barn will supply a big chunk of the extra raw leather you would need to do it every day but not all, so it means more skinning or the auction house to get the rest.

There are a couple of things you can do if you can't leave your garrison long enough to do some skinning:
Convert surplus mats/GR into Leather using the Trading Post
Spend surplus Primal Spirits on more leather

Both have limited use and/or are very expensive so I would only do them if you have exhausted all the other options but still need that one or two more leather and can't wait for the next day.

So, with a little bit of gold or time spent, you can increase your Burnished Leather generation to 47 per day.

If you want to take it even further, with gold (or time if you are farming mats yourself) no object, the traders will convert 5 raw mats into 1 Primal Spirit outside of the daily quest.

Herbs are usually the cheapest at around 75s on my server, raw leather is around 1.5g, so you are looking at roughly 19g per 2 Burnished Leather with the limit only being the supply on the auction house or the depth of your pockets.

Happy crafting!