1. Outside of the avast FAQ for AAVM error actions - Commonly this is due to either another AV or remnants of one still on your system.
So I don't know how effective the avg removal tool will have been or if you used this one - AVG Remover, download tool from here,
http://www.grisoft.com/ww.download-tools there is a 32bit and 64 bit windows version, ensure you use the correct one.
2. When Online Armor is installed it blocks avast processes which have been updated after a program update, this can lead to increased boot time. Because OA doesn't notify that it is blocked you aren't aware of the reason. People used either learning mode or install mode to have OA allow the changed to avast processes after a program update. I don't know if you have the latest version of OA which was also recently released.
3. I can't understand that one at all sorry.
4. This too is a common issue with another AV or remnants of one still on your system.
5. Not sure about this one either, don't know if this is possibly related to 1 and 4 above.
I will pre-empt your question but it worked before and you removed avg, it works now with an older build but not 1296, but I have seen stranger unexplained things but the update could be the catalyst that find things previously not found.
I appreciate you don't want to spend time getting things to work, but the unfortunate fact of life is someone does have to help pin down the problems, there are a lot of people here prepared to help but they would need you to help too.
Whilst I don't know if 4.8.1296 might help resolve any issues, but updating just one system could answer that question. I don't know if you use hard disk imaging software to back-up your systems, if so you could do a back-up first update to 4.8.1296 and if it doesn't resolve it rollback using the image.