I am having this same issue! I spent 3 weeks resetting to get all the features I wanted and got almost all of them but for whatever reason, something doesn't feel right! I can't even really put my finger on it. I don't want to regret resetting an island that I spent ages looking for though. I am honestly at a loss for what to do...
I reset my 'perfect' map and I don't miss it. Something didn't feel right and it just kept bugging me and getting worse until I just decided I needed to restart. I'm now looking for something different but I'm being much more relaxed about the criteria I want. There's a specific map layout I want and I want the largest peninsula so I can move my house there, but everything else I'm not being fussy about - hopefully I won't be resetting for long!