Hello!
This is Jack from Masterstroke Games, long time lurker. We're a small team doing a game called Force of Virtue. The game is focused on the Italian Wars and currently specifically Roses.
However a there has been a lot of interest from players in us doing Wars of the Roses. However being originally Swiss most of my research and background is based around central Europe.
We try and rely on first hand accounts of actions and chronicles of smaller engagements rather than the battles to build the card decks for our game. There are a fair few good ones for Italy and Switzerland, the Schilling Chronicles, Montluc, Bayard, Cellini etc.
For War of the Roses I've struggled to find those kind of biographic accounts beyond the Paston letters which are a treasure trove, but gathering as much as I can. Froissart is useful but a bit late and a bit fanciful at times.
Considering this is a very well read corner of the hobby I wanted to check in what sources others might have stumbled across. I'm happy to dive into middle English if necessary.