i remember now looking at your log that i saw similar crap but not with 1337,
2 other coins, and it was weird 1-block timeshift in database ops,
for every request of block N wallet actually received block N+1 or N-1 to process,
so no matter the nodes and such, any block couldn't pass the check.
sync precisely your pc clock (to time server),
if doesn't help try this in your conf:
synctime=0
i doubt it'll help but no harm in trying
My clock is synced, still no luck. Tried the synctime=0 config flag, still no luck.. I'm hoping somebody with a fully synced chain will upload the complete blockchain somewhere.. :-)