I use Session Statistics and Battle Result Messages in Aslain Modpack 9.19.0.1_03 and the Avg. B Tier is wrong reported. I played two battles at tier 8 and Avg. B Tier says "8.5 (+2.5)". I played only with a 6th tier light tank.
I saw this small bug in all versions of 9.19, but I hoped will be addressed, so I reported just now.
Aslains_WoT_Logs.zip