Cool, that would be very helpful in helping us to help you.
Oh, and try to use screenies for those of us who can't open your saves for various reasons; it'll open up the floor to alot more input.
Regarding stack and military production, let me chip in my two cents (at the behest of LM). I generally designate one or more cities as solely for production of military units (I call these cities "Gun Pumps"). These are usually second tier hammer cities. If a city is too good, you're going to want to build wonders or space parts there; there will always be something. A good candidate for a Gun Pump is a city that has good production availible, but maybe not alot of food, or overlaps with a more important city and doesn't have a full 20 tiles to work, to where it will probably end up capping out early on pop. This city gets a barracks, stable, granary, courthouse, forge, factory, HE, settled MIs, and only the health and happiness buildings necessary to keep it going (unless the computer makes it the Holy City for the most popular religion - like in my current game - necessitating Market / Grocer / Bank / WS /

). It keeps spamming units non-stop.
Here's an example from my current game. I'm Hannibal. Carthage and Utica are OUTSTANDING hammer cities; I'll be building Wonders in them. Hum-drum-town (or whatever the Carthaginians call it) I found on a river (good for future levee), surrounded by plains, and plains hills. Even with the plains farmed and the hills later windmilled it grew slowly pre-Biology. Initially, it built garrisons for my cities. My standard garrisons are 2 Archers (or later equivalents) and 2 Horseback Units - the Archers for immediate defense and the horsemen for flanking and offensive ops - that's also why I value Horseback Riding more than most, as it's a key element of my defense. In between, I work on constructing offensive stacks.
I build my stacks around the concept of combined arms army groups. Generally, they consist of 9 siege units, 9 attack units (swords/maces/rifles, etc), 4 mobile units (HAs/Knights/Cavs, etc), 4 stack defenders (Drill promoted, usually starting as Crossbows), and 1 medic (usually a spear/pike, and later an Explorer). Some folks will advocate more Siege and less Attack, and I won't argue with them - this set up just works for me. And I just keep building, organizing, and updating them around this concept. These Army Groups are the offensive formations for attacking the enemies cities. During wartime ALL my cities will change to unit production and these units will be organized as city garrisons around the concept of 2 defenders and 2 mobile units and fed to the front as such. In a non-warmongering game I'll have about 4 such Army Groups by Rifles and about 20+ by the time Tanks come in (and the organization changes significantly then, but we'll cross that bridge when we get to it).
The important thing is to A) Have dedicated Gun Pumps that won't be distracted into producing other things, B) Organize the troops into combined arms formations so that you can acheive favorable matchups and minimize losses, and C) Tech well enough to maintain an edge on your opponents. C requires the most important aspects of playing the game, and that's in managing and maintaining a thriving economy - without which all is lost.
Hope this helps.