Ok, so I've done a bit of revision and I've corrected a few things in my original post.
1. I got my base damage values a little wrong - 5% wrong to be exact! I forgot that experience doesn't come from army techs

o As a result, the base damage numbers look much nicer and I realised that there is a 100:1 ratio between strength damage and org. damage.
2. I was a bit off about the effect of experience. It isn't simply added to tactics and discipline, it acts a divisor of damage in and of its own right. To illustrate (because I'm afraid I don't have the terminology to properly explain what I mean) if you have 100% tactics
or 100% experience, your damage is halved (your damage is divided by (1 + 100/tactics or experience)). If you have
both 100% tactics
and 100% experience then your damage is reduced by a factor of 4 (not three as my previous equation suggested). Your damage is divided by the enemies tactics and then again by the enemies experience. In the case of discipline damage, it acts to divide damage after discipline has been taken into account. I have updated my equations to reflect this. I've also added in a little bit at the start to account for the fact that the base values are adjusted for units with a strength of 3000.
3. More of a clarification - For the purpose of dividing the dig-in value, recon is assumed to have a minimum value of 1. A recon value of less than one therefore does not increase the dig in dice malus.
Finally, I did briefly check the effect of recon on occupation. Firstly, it isn't entirely deterministic. The time to occupy a province does have an element of randomness. With that in mind, I didn't go into particular depth with this mechanic. I just have a couple of very general observations rather than any algorithms. Firstly, I tested the occupation in three provinces (hardly exhaustive), two farmlands and a woods. They all took about the same time to occupy. Secondly, an army with a recon value of 1 took about 90 days to occupy each province. The terrain did not affect the time taken to occupy. Other terrain might, I don't know. The occupation time was roughly halved when the recon value of an army was around 20. There is no difference between having 20 units with 1 recon or 1 with 20 recon in this particular instance.
Before I'd go I'd like to spare a thought for the poor Dutch and Belgians. So many wars of unification