Which version of registration tool do you use?
Please try to use the latest version, and download here:
http://code.msdn.microsoft.com/crmpluginI have found that the tool included in the crm sdk is outdated and buggy.
Otherwise I don't understand your coding concept clearly. Have you tried to compile and use your own crmproxy (Plugin2.CrmSdk) ?
New plugin concept force you to use factory-built sdk, and ICrmService instead of dynamically compiled crm service proxies.
Regards,
Tibor
SzT