*update*
At first I proceeded along like I said a couple posts up, making some upgrades at the perimeter and keeping a large weekly surplus. But then over the course of a couple weeks a number of things happened:
-I realized I was very unlikely to win my league with a slightly upgraded version of my roster.
-I decided to list some of my other players for prices that I though higher than replacing them. To my surprise I made a number of sales which netted me a good profit over buying prices some months previous.
-I realized my biggest strength so far in this game has been finding good value on the transfer list and making money on reselling players, and the more often I bought/sold the more often I would be utilizing this.
Combine these with the fact that the top teams in my league were all very outside oriented on both sides of the ball, and I decided to completely remake my team into a look inside team before the playoffs.
I ended up turning over my whole roster about 1.5 times because of some indecision at the start, and I also made some mistakes selling a few players with no minimum price, but besides that I think it worked out. I went from being ~10 point underdogs to the two best teams to beating both by 35+ in the playoffs. I also was able to spend an extra ~450k on my stadium.
I am curious how people think my new roster would perform at D3? Here is an example game:
(49328891) (played at high gs/enthus/effort).