So I think the answer to what you're doing is "It depends". It depends on the capacities you have available. I'm running a 4" 4 plate column on a 55 gallon set up with 11000W available heating. 2L per hour for a 4 " column, in my mind at least, is low. the "ability" of the column is probably around double that. I've pushed my column to 8L or around 2 gallons per hour. That's running around 9500 Watts. This was on a bourbon mash. The resulting spirit, once you get past the heads, which was really compressed and really quick, wound up being a little tailsy throughout the entire run. It's sitting in stainless now and I intend to do a second pot still run slower in an attempt to clean it up a little. In retrospect I should have been running a little more dephleg, and my column was trying to tell me that(Didn't have a vigorous boil on the bottom plate)but I'm still learning too. We'll see. I've had a little dab on oak, and it's not bad. There is another larger distillery near me that strips in a 500 gallon steam jacked still with a 12inch, 4 or 6 plate column, can't really recall. On a stripping run he'll hit as high as a gallon a minute. To me that's way too fast for that sized column, and the whole thing has a tailsy quality that doesn't come out in a spirit run. I think he's actually making esters or conjoiners by overheating the wash, but that's I guess, a little different topic. So, I guess, long story short, I think you can certainly over run your column, but I doubt you have anywhere near enough power available to actually do it.