How spicy is each book in the Briar U series?

smutrecs.com has rated 2 books in the Briar U series by Elle Kennedy: Book 1, The Chase (3/5); Book 4, The Dare (about 4/5). Not listed here: Book 2 and Book 3.

1. 
   Book 1The Chase spice 3/5
2. 
   Book 4The Dare spice about 4/5

Each book page lists the sources behind its ratings. Ratings marked "about" are estimates. How we rate