Best 'Natural' Linking Structure for 50 PR4-5 Site Link Network

I've currently built up a private network of 50 PR4-5 WP blogs that I'm using to support one of my larger whitehat money sites. All 50 blogs are currently independently operated and do not have any outbound links. I need advice on how to link these tier1 blogs to my money site in a natural manner.

A little background on the money site. It's a PR6 business blog. I publish ~5 articles a day on medium competition keywords. There are currently around 500 articles. Without any linkbuilding, the average post lands on the second to fourth page for the targeted keyword...hence the reason I'm building this private network to support.

I'm wondering what advice you all have with regards to a linking strategy to support the money site. I was thinking that I could build 50 inbound links, one from each support site, for every post. This would involve writing a spun version of a related article to post on all 50 support blogs every time I create a new post on my money site.

This sounds like it would provide the most link juice. However, this seems like it would look extremely unnatural to G*****.

How would you structure the linking? Remember, my main goal is to increase the rankings on my main money site. Traffic and monetizing the support sites is not a priority at the moment.

Thanks in advance for your thoughts

I don't think you'll have too much to worry about if it's your own private link network.
If youw ant to be safe, throw some random links to other sites, other than just yours.
You're going to get the most out of it, if you leave your link on the front page of the blogs. You could always sticky one link on the front page, then link to another page of the money site, that will slip off the front page, and look more natural, assuming you're still posting on the blogs.

I'm assuming each pumper site is completely independent, i.e. separate C Class IP address, different designs/themes, etc.

I would keep the max OBL's from each pumper site to below 20, and keep it random, i.e. do not link to the same main site post/page with the same pumper sites.

Also, remember to link out from the main site to some related authority sites as well.

Gradually drip home page links out to your main site over say 1-2 months, for your main keywords.

I am sure you would have hosted the websites on different IP's.. if that is the case then you can make 10 blogs target to your money site and the other 40 point to those 10 blogs randomly