Good day.
It’s really hard for me to make suggestion as I am really not familiar with your soil or the machines you are looking at. What I would mention is I have a B2650 and it handles a 58” landpride reverse rotation tiller just fine (it’s used in rocky clay sand soil). Somtimes on virgin plot I have to make a couple passes or slow down/not take so much per pass. But it runs it just fine. I also have a MX with a 74” reverse rotation and it’s sort of a different animal…even in virgin plot I still need make multiple passes. I personally would not be worried about the L3200 running a 60 or 66” tiller, but I really don’t know myself. (I would think 5hp / feet width is a good starting ratio but I really don’t know)
If one of your main purpose is tilling…If worried about buying to little machine for tilling to your expectation, I’d try to find a neighbor that has similar soil to yours and has a machine / tiller combo that operates to your expectation (power wise) and then see what the ratio of PTO HP to width of tiller is…look for something in that area. Or if the machine you trying to buy comes with tiller, ask if you can try it.
as far as tilling there are some things you can do to help:
1. Make sure soil is correct moisture level…this makes a huge difference….it really does and also will help with nice fine seedbed.
2. If virgin plot, and worried about power, scrape the sod off first before tilling.
3. Don’t take so much each pass when tilling.
4. You could use a cultivator or chisel plow first? Also in lieu of a tiller maybe a disc?
if doing all those things and not happy with result, time to pay the piper.
Good luck.