Your land sale analysis sux. Are you aware that not one of the first 6 land sales is directly comparable to your subject site? Did you even look at any of these sales? The 2018 sale is zoned R2 and it looks like they basically condo-ized that parcel. The other sales include a couple with views, sites with significant topography, most of the sales are way to the south in very different types of neighborhoods and so forth. Your analysis did address views, water and permits, but not locations or topo. If your assignment was to appraise a vacant lot next door to this property on Hibbert Ct this land sale analysis would be completely unacceptable by any measure.
Data qualification is a thing. You cannot - and indeed did not - overcome your lack of data qualification by simply throwing more unfiltered data at your analysis.
Then there's your use of a published apt cap rate for your income cap on an SFR. That's both lazy and dumb right from the outset. If you're going to go after an income approach on an SFR then why would you use a published rate for multi-family including investment grade properties instead of extracting GRMs from the local 2-4s? If you're that hot to cap NOI instead of using a market-based GRM - both of which are measures of income converted into values - then you could build cap rates by working backwards off the known/knowable rents.
I didn't go into the sales comparison - maybe you're using more diligence on that. But what I'm getting so far from the short take is that - as usual - just because the calculator can spit a number out doesn't mean that number is going to be meaningful.