Woah, this is a good question. I prefer 1st person past tense as it's my default and easier to write.
I've done 1st person present too, a device in the past used to break the 'fourth wall' and guide readers into why something is happening. It's a little harder but I have always avoided 3rd person present, so much harder to remain in tense. As for 2nd person - I struggle - why? I imagine addressing the reader in 2nd person is a way to raise tension, a useful vehicle, and not one I have felt the need to use.
I really get WW too on the use of adverbs - I find that using them hides a need for description that *might* be required. Again, it's easy, especially if a little fatigue creeps in to start peppering them around with abandon. There's a great app called 'Hemmingway' which I use for highlighting adverbs and sentence structure.
Setting a word limit at a sitting has kept me out of bad habits, however, setting a target when you are not feeling it is another kettle of fish altogether.
Lastly, the thesaurus of 'he said', 'she said'. I will start any conversational piece with who started it, then to let it flow with prompts to the reader so they don't lose their place. I've used emotive expression like 'opined' and 'surmised' before rather than how they said it.
Absolutely, the last word... kiss. Find another word for that, and a thread in its own right no doubt.