I've had the same problem as you had. I was also using the prism MCPC edition on my 1.6 DW20 server. At the moment I'm also using coreprotect and it is working really good. I've already banned a hand full of players for griefing/stealing.
English version (country where I live is Belgium):
I've got some questions about Taxes that I might need to pay.
1) After which amount of money are donations illegal (I get money as a donation to the server and give something like a rank for this to a player) or is this completely illegal...
Hello players,
Me and David finaly made a decision, we are going to do a complete reset on our Direwolf20 server!
I know not everyone wants areset but we promise it wont be for nothing! This reset will solve most of our problems (corrupted chunks, lag spikes, crashes when players try to join)...
I went to the IRC channel around 2 weeks ago, they gave me the recomended version of prism for MCPC 1.6.4
I've tested it for a whole week and I was constantly spammed with Server Error's.
Thanks for your answer.
I found this plugin on the FTB website (CoreProtect), they recomend it.
Link: http://forum.feed-the-beast.com/threads/offcial-ftb-server-plugin-thread.19429/