Four 301-redirects from ‘www.myproject.com’ to ‘shop.myproject.com’ (am I losing my Google PageRank?)

Some years ago, I started my website with the main domain ‘www.myproject.com’. However, the project ended up being a store under ‘shop.myproject.com’.

I obtained hundreds of links to ‘http://www.myproject.com’, and today (after two years) I found that the redirection is not well-constructed, because there are four 301-redirects from ‘http://www.myproject.com’ to ‘https://shop.myproject.com’.

I have two questions:

  1. Should I fix urgently this issue of "too many 301-redirects" in order not to loose my Google PageRank?
  2. Is there any quick Rewrite Rule for Apache 301-redirect from ‘http://www.myproject.com’ to ‘https://shop.myproject.com’?