All good points made, IMHO.
Now, I will say up front that I always play as th French, so all my comments come from that perspective.
I utilize a mod which forces me to produce guns only in select major locations, so I have to take acre of them, and move them expeditiously to my forces. I did this as being able to produce them like water seems a tad too easy.
As for the numbers, I would support a low limit on artillery unit numbers because they are such a significant impact on battles.
I also agree that the howitzers are too deadly - yes indeed.
In the spirit of ideas instead of complaining... my suggestions are:
1. Reverse current prevailing game logic... See what can be done to make artillery effective at long range and
less effective up close. My intent with this is to try to encourage
ranged use of artillery early in the battle, just as they were are the time.
2. Dramatically increase the morale effect of artillery which, in my humble opinion, was also its main damage factor. Change the damage of artillery from casualties to morale, especially grapeshot.
3. Make artillery very expensive and hard to manufacture.
4. If possible make it impossible to kill but easy to rout - my intention being to have artillery survive battles (unless the army is totally destroyed) and thus make it less necessary (or even impractical or unecessary) to manufacture it and perhaps help reduce the artillery-dominated armies that seem to be created by the AI.
5. Find a way to enable the use of small guns to accompany infantry brigades - add some drama to the close action without adding the game-changing effect that artillery can have
6. Find a way to give artillery a high effect on morale for it's own army's units, like a general, perhaps? I believe it made a significant positive impact in that regard.
7. Find a way for the loss of artillery to have a significant negative effect on it's own army.
That's all for now.