My Shindaiwa T261 weed eater is bogging down when accelerated. Unit have a new carb, air filter, fuel filter, spark plug and the exhaust and fuel lines have been cleaned. Fresh 89 octane+2cycle(50:1) has been added as well. The unit have a compression of 150psi. What else may cause the Shindaiwa T261 weed eater to bog when throttle is fully engaged?