Glad you experience was a good one!
I use a 300mm mostly on my 8x10. I just read a thread over on the LF Forum which asked what lens folks would have if limited to only one lens. The range was primarily 240 to 355mm, with a few at 210 and 480mm, so 300mm seems to be right in the middle -- and I do like it. (I have a 159, 210 and 480mm also -- and a borrowed 600mm that does not get used much).
I have heard that using a filter behind the lens can change your focus, so it was suggested to fine-focus with the filter on -- but at f/32 you may not have seen any difference. But might become a factor with portraits shot wider open.
But again, congrats on your success!