I'd re-run the calculations based on different angles of panels - you don't want to optimise year-round collection (and have a surfeit in the summer by sizing for the winter) - you want to maximise production in the winter, and miss out a bit in the summer. So your panels will be angled more steeply to catch more winter sun. and you'll be down in power in the summer. However - all this makes a few % difference, maybe into early double figures - and so if you have space then a few more panels than the minimum is better.
But in the winter you can have days of bad weather, rain, snow, and basically no sun, so going off-grid completely can be costly to cope with all that - you either need batteries galore, or a generator for those times, or grid that you sometimes use. These are in most expensive and most environmentally friendly order first to last. If you must go off-grid, I'd buy a small generator for the really bad days, and if you want to go towards more and more renewables, batteries are likely to drop in price over time; generators less so......