I have never seen on any of those charts show you can put more than 5 wires under a single connector. I believe method of shoving all these wires under one wire nut is poor.
Ideal #30-454
3 to 6 12 AWG
5 or 6 14 AWG
If you make the splice as Hal (hbiss) described it will be a fine splice.
This thread is a good illustration of how we each have are own methods of working and each way is 'right' for us.
For myself
The 'bridge' method described by macmikeman would be a last resort for me.
I would need a gun to my head to use a Wago as described by Electric Eagle.
A split bolt for 6 or 8 conductors, not a chance.
To each their own as long as it meets code.
Bob