What FMU are you using (ie. 12:1, 10:1, 8:1 etc.)? Are you monitoring the MAF voltage at boost and is it pegged or close to being pegged? None of these would affect making more boost but can have an affect on your a/f . It’s hard to read your printout but if I’m reading it correctly it looks like your mixture goes extremely rich at around 5300 (if I’m reading the min/max/avg correctly it actually goes negative). I would consider investigating if you are using the correct ratio FMU, you may be creating too much fuel pressure under boost causing the rich condition. As a previous poster mentioned, this could cause some serious issues by dumping too much fuel into the cylinders, washing oil off the walls, causing premature ring failure etc. etc.
On the other hand, you say it’s running better than ever and that’s a good thing!