All questions related to installations, configurations and maintenance of Advanced Host Monitor (including additional tools such as RMA for Windows, RMA Manager, Web Servie, RCC).
1000 records for each test item? I don't think its a good idea to store so much data in the memory, especially when you have 10,000 test items.
I think you may use Log Analyzer (just select test and click menu Test -> Log Analyzer)
Then you may increase log size up to 400 records using undocumented QuickLogSize option.
You may add QuickLogSize=400 line into [Misc] section of hostmon.ini file and restart HostMonitor.