That pump probably isn't a great choice for that much hardware. For signs of flowrate, often temperature is a good indicator of whether you've got enough flow for it.. Also look for surface disruption in your reservoir. You should see some shimmer of flow movement, or watch for how quickly bubbles are flowing through your setup if you shake your case or radiators or tubing around.
I would recommend either a swiftech MCP355 or MCP655 to replace your existing pump with. Often people (myself included) recommend switching to a pump that isn't the stock RASA one when building their system out from the original RASA kit, due to the high failure rates that were occuring with the stock RASA pump, as well as the flow rate, which is fine for a stock loop, but once you expand your loop it's best to add a pump with a bit more oompf.