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MSP430FR6043: operation frequency is not stable

Part Number: MSP430FR6043

Hello!
I use MSP430FR6043 evaluation board with MSW-A10400H07TR-W (400kHz) ultasonic sensors. I try to get maximum operation frequency. I commented 

out this line of code in USSLibGUIApp.c:

        USSLibGUIApp_Delay();     /* Delay for proper time  */
as you advised in the other tread (e2e.ti.com/.../963047) and get 100Hz frequency. But it changes when the flow in the tube increases. For example when the flow is 12l/s sample rate is about 80Hz. 
I tryied to change Capture duration parameter but it don't influence the frequency. 
Can you tell me what part of the algoritm takes more time when the flow in the tube increases? May be there is some more delay somewhere?

Thanks
Katherine Babaeva

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