Hey, this sounds like they are giving you the run around!
Also, did you request a copy of the dispatch log? That will be the complete log of the day or shift that your incident happened on ... this cuts out the "searching for phone call records" crap ... as for the phone calls, unless they record those, which some probably do not, you still have the one side of the conversation from the dash board camera footage which you already have.
As for the emails, read this guys emails and letters (you don't need to go into the court docs and filings yet) and you will see that he requests copies of documents to be delivered to a local officeunder FOIA so that he can peruse them to determine which pages he needs copies of ... this way, he doesn't incur the costs of searches and such ... simply request a bulk printout of specific dates or ranges of dates. They will make a hard copy of this information at some point for storage, so you do not incur that cost yourself, then you are back to up to $1.00 per page, but this rate should be posted somewhere ... look in the court clerk's office or similar.
Keep being a nice, reasonable young man and you will accomplish more than if you present a confrontational attitude. You also might contact the first ranger and record the conversation ... I can see something like, "Man, was I such a really scarey guy?" Be smooth and get him to tell you things that you want to know without asking outright and pointblank.
Be sure to get email addresses of the folks you are dealing with in the gov't offices and ask to conduct this through email correspondence ... that gives you a printed record of all transactions and date/time stamps.
The system is supposed to work for you not against you, but sometimes you have to circle around to get where you want to go so you don't tip your hand too early.
Good luck and keep at it!