Ah yes, the hoof-rats are a menace in so many ways. Our place is the local deer-sanctuary since most of the invasive mansion-building city-folk fence their entire property to keep them out, and/or have dogs. We just have the garden and a small back yard fenced; if it was my call, I'd fence the orchard too. The deer density is even starting to be a an erosion problem on their favorite trails. Ridiculous.
Even just straight comfrey as a base for compost tea is worthwhile, though I admit I rarely get around to it. The deer don't seem interested in our comfrey, and it competes well with grass. Can be a menace though; we don't have the fancy sterile bocking-14 type, so we have to keep on top of it to prevent it going to seed.
You could try one of the enclosed plastic composters; I see them on usedvictoria for free pretty often. They are kinda lame since they're too small for proper hot-composting, but throw some red wrigglers in and it does work, just slower, and won't kill weed seeds. It's my dad's preferred method since it's kept the critter-problems down.
There are a variety of schools of thought on training apples trees... A fairly standard example is here.
http://eap.mcgill.ca/CPTFP_7.htm
At the saltspring apple festival last year my favorite two orchards could not have been more different; Salt Spring Apple Co is a young orchard with extremely high density in rows, wire supported, on dwarfing rootstock, and he is following the french method of bending branches to control the tree, avoiding pruning whereever possible.
Meanwhile, Apple Luscious is a mixed 3-acre orchard of full-size trees, smothered in himalayan blackberry; pruning is minimal from what I could tell, possibly due to lack of time. I saw one hugely fruit-laden tree with the top freshly broken off.
Anyhow, back on topic: I took at look at our Gravenstein, and pictures are below. The Gravenstein leaf is on the left in both comparison shots; the others are just a couple of other apples I passed on the way back, to illustrate the size range.
These are all oldish trees, could be anywhere from 40 to 70+ years old; never fertilized, on poor soil, many with disease, and half requiring timber supports. They are irrigated in the summer with water from a peat-bottomed pond. We've no idea what rootstock they're on, probably a mix. The Gravenstein is one of the largest and healthiest of the 35-odd apples, but production isn't too impressive, presumably because it doesn't get a lot of sun. Hope that gives you some basis for comparison.