shipping rates not returned - irratic UPS & USPS

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I'm running out of ideas, open to any suggestions. I've open a support with EA and have been back and forth for ~2mo.  I have contacted hosting several times with little success.  I've contacted UPS. Little success.   Not getting returned shipping rates is horrible for customers and business.  I need to fix this NOW.  

Below is a Hx of problem (note, there may be red herrings) as I noted changes with host and ProC.  I then listed a hx of troubleshooting.   At the end is current store information as displayed in  ProC troubleshooting utility.

Hx of problem:
host provider upgraded from 32x to 64x  IIS servers.
shortly afterwards, issues with getting returns of UPS /USPS rates.  Sometimes they'd show up and sometimes not.  Usually just one would return during check out and that was usually USPS.
At that time (August 25 2012), store was still v3.51

Note, that when rates are not returned, if the browser is refreshed then rates are displayed, usually both UPS & USPS.

hx of troubleshooting:
Store was upgraded to v4.6 sp0 a week after host updated servers  and errors continued
hosting provider updated XML Parsers v3  & v6.     after several days switched to v3.0 as suggested by EA
Open support tkt with EA.   Basically the time out of ShipRates.asp was maxed out.    Still no consistent returns.  Refreshing browser will return rates
contacted UPS, with conversation, since store gets rates with refresh of onepagecheck process it seems ups is serving up data

Open to feedback
	thoughts, ideas
presently, i'm working on trying to migrate to a new host to try and see if the issue duplicates

STORE INFORMATION

You are using ProductCart version 4.6 Service Pack 0

MSXML2 v3.0 Parser INSTALLED

SERVER NAME 

SERVER PORT = 443
SERVER PORT SECURE = 1
SERVER PROTOCOL = HTTP/1.1
SERVER SOFTWARE = Microsoft-IIS/7.5