You're starting PF and C are good for zone, but your back ups are weak. If a team doesn't shoot a lot of 3's I would put Barrington at SF and run 2-3, but besides that you should always run 3-2 with that group. The problem with starting Bower, Blaney and Degan is that the other 2 will pull down your def rating that's averaged out with Degan. I would start Barrington, Blaney, and Degan. Give plenty of distro to Degan and Bower.
Here's my chamindae team:
https://www.whatifsports.com/hd/TeamProfile/Ratings.aspx?tid=14324. If that's any help. Trust me I'm no expert at zone and quite often ask for help. I would attack you from the inside out because your Ath is low for your front court. Also Flex relies more on 3's and good Pas from your bigs and SF. Just my 2 cents