I think its important to have multiple pages about the selected keywords. Not pages that are the same but to use the kiln dried logs example I would make pages like below.

Why hey our kiln dried logs work so well in wood burning stoves.

Hardwood kiln dried logs

softwood kiln dried logs

how we make our kiln dried logs

sustainabley sourced logs

why are kiln dried logs better

I would link all these to your page that actually sells the logs and if you make sure that each article is specific to its title and they are all different yet relevant then they should help you keep on topic without dilution.

I have found pages with 1000 plus words and various pics references and a video or animation rank very well. I'm sure if you hit 5000 words it may get a bit out of hand but in my experience more is better within reason. It's the video or animation that I find really makes the difference. I still count 300-400 as a bare minimum.