The 'Check point too old message' is only a text message and has never created any problem in the 4 1/2 years of existence of PHS.
I don't think we should be toying with the conf file policy. Unless we know 200% what we are doing with this!
Thanks for the informations. You are right lowering the checkpoint policy (default
"strict") could be too risky. Therefore I reset the policy back to "
strict" today. I hope that the wallet syncs normally and I just ignore the warning message until we have a newer checkpoint hardcoded in source code.