With those ping times, I'd definitely move one to useast and one to eu and start testing. My times to eu are 3x that of the us servers, so I've never bothered.
well somewhere along the line, useast dropped from 100 ms to 10 ms latency.
pointed 1 rig @ useast and 1 rig @ eu. will report back in a few days on my findings
minor update: eu is reporting 200-300 less WU after running for about an hour. previously, uswest was a consistent 1.3. so, for me eu is definitely no good. moving both over to us east asap
minor update2: anyone else with 2 mining rigs @ the same server observe that sometimes the cgminers don't have the same difficulty??? Sometimes, i see one of my miners takes a few minutes to get the network difficulty change. So much infact, that i just saw one of my rigs not get the network diff change at all. It went something like 488->11->11->10 while the other one happily sat at 488 and both were getting accepted shares at the different difficulties

other times they both get the diff change within seconds. it just seems kind of odd