I'm getting mixed reviews. I think I'm going about building this amazon niche site the wrong way. In the last 2 days I've made four 3k review articles. Targeting 2 main keywords and 10 to 15 long tails in each article. Is that way too many? Will that keep the page from ranking properly? I'm hearing some say target a max of 4 or 5. Then I'm hearing about Keyword cannibalism. I need some advice. Still new to this amazon niche game.