Keyword Density And Page Layout Question

Hey guys,

I usually keep my keyword density at about 0.8% ish but I am a bit concerned about how I structure my posts, this is what I do.

I get a valuable seed keyword, lets call it "how to make icecream" and then research longer tails associated with this keyword (that have decent CPC and searches, lets say "how to make icecream at home", "how to make icecream without milk" and "how to make icecream without sugar".

1) The seed keyword i put in the URL and h1 tags (title) and after the introduction, I put it in h2 tags. (I make sure it flows well)

2) I put each of the longer tail keywords in h3 tags and write about 300ish words per heading.

3) Then I sprinkle the seed keyword a couple times in the body article (normal text)

4) Then I take about 5x LSI keywords from bing and Google and put them in the article (where it makes sense)

Most of my articles are ranking in the top 10 so I guess it must be working but I was just wondering if this was the best strategy, especially with the new Google over-optimization algorithm.

Thoughts?