Do the T as suggested.
You should expect >6lpm flow rates with the Eheim 1250, the White Water and the heater-core. If not, then it will be the heater-core that is holding you back somewhat.
If you're achieving 6lpm (~1.6gpm) then it's all good. Very little to be gained by pushing flow rates higher than that with the White Water.
Oh, and don't submerse the core - they're not particularly designed to be submersed and it's totally unnecessary, and then you won't have to worry about whether when you shake it if it's water from inside or water from outside.
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