You have to be moved into the accepted group to access the #announcements channel. I have moved the account that I assume is yours to that group.
There happened to be a setting that somehoe got turned on from V2.1 to V2.2 (Don't ask me how, I don't know) that caused ChromatiCraft to enable its Retrogeneration feature. It has since been disabled, and was identified as a significant cause of major lag due to the way it was processing other dimensions. The issue is not apparent in Version 3, and I would also reccommend generating your worlds with Render Distance = 2 and then moving it up to Render Distance = 9 after the world has loaded.I'm not sure why, but this modpack seems to run extremely badly on my computer.
I think the FTB launcher shows no mods because they are all in a "1.7.10" folder inside the "mods" folder. It seems this design decision is tripping up their detection.