i am using multicharts with IB data feed. Kospi data is free and Hang Seng futures data is like HK$10, compares with CQG's US$600 plus per month. But you need to open an account with IB. i don't think esignal has Kospi data. IB's data is conflated though.
I suspect the volume spike that you see in IB's data is a result of the aggregation of trade volume. They used to send out total volume every few seconds or so and you can calculate the volume within such period by comparing the two volume figures at the begining and the end of such interval. My...