I have filled out Schedule F forms for the past 9 years and have never been audited. Like you I always keep really good records and can easily justify my costs. I did go full-time farming about a year ago, but the language of the IRS is simple and has not changed: "attempt to make $1000 a year in profit". Gee wiz, if a farm had to make a profit every 3-5 years there would not be a dairy farm left in this country and why the word ATTEMPT was added by congress.
There is some talk of putting the farm profit level up to $15,000 but that will never happen. People LOVE farmers and no politician is going to risk losing an election by irritating their constituents, especially someone as loved as farmers are. Can you imagine the election campaign and ammunition given to the person's adversary, "and my opponents wants to make things harder for the small family farmer by increasing the farm income requirement too $15,000"...no, it will never happen.
There is a huge difference between timber holdings (tree growth) and farming. I log, and I farm, but I am primarily a farmer. The IRS understands that farmers are inevitably going to have places they cannot grow crops and thus want them to manage their forests. I fall under that as a sheep farmer even, so when I cut wood (a lot of wood), it goes under my farm as income and is completely legal. But they also recognize that trees provide food and income. Christmas tree farms come to mind, and of course yourself. They know farming takes a huge investment and that it takes a long time to go from part-time to full time status...look at me...9 years. It is very understandable that you will take awhile as well.
As for some of your deductions, just be wary, some sound like true conservation deductions and some sound like capital expenses and never the two shall meet, right?

I got a book from the IRS on filling out the Schedule F and it was invaluable for making these financial decisions. But I HIGHLY recommend you fill out the Schedule F forms starting as soon as possible. EVERYONE wants to see them. It is more then just for subsidies, it proves you are a farm, hobby farm or full-time farm. Most of the time they do not care if you make a profit or not, just that you are a true farm, without a schedule F you cannot do that. In all honesty you really are handicapping your farm by NOT filling one out. Most of the time they ask for the last 3 years, so the sooner you start, the sooner you can get loans, grants, and yes subsidies if you wish. Its nothing to discount now, a lot of help is available for beginner farmers.
There is a ton more to say on this, but I cannot say it enough; Schedule F's are the key to farming.