You approach is similar to mine. Rather than a text file I like to use magic workstation, adding cards I'm sure I'll be playing to the main deck and cards I could consider to the sideboard. I tend to get up to around 300 cards total before I start tweaking down.
My group is not huge on playing lots of acceleration, as a result I don't play much of it either. I'm aware that if I would I would probably increase my win percentage for a while, but they'll just catch up in the arms race eventually. I much prefer longer games and more room in my decks for additional synergy, so I don't want to be the one starting this arms race (and my win percentage is already quite high regardless).
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