Hi Zoyer2
Glad you like the pack, and i am looking forward to see what magic you make with it.
About your questions
Not sure what you are referring to on the “Synced Better”, are you referring to the way the debris moves on each of the clients? can you send me a picture or screen shot please.
About the Characters pinging about and bugging out 
that should be an easy one, the value is called “large Chunk Threshold” on the BP when you select the Destructible mesh ( i have made an override under the dent configurations on each BP and should be called “Large chunk override” … the higher the number the larger the chunk that will be ignored
the reason for this - the server does not actually render Debris, its handled on the clients so the out come is sightly different on each machine ( the fractures will be the same though)
**a wee tip, this tripped me up for ages - ** if you stretch the DM when its in the level it freaks out the collisions of the debris as well so make sure any scaling is not done in the Level
Simon