Servo problem

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I'm suffering a a bit of grief and a bit baffled why ....

 

I have coupled up my Propeller Server control USB unit (PSCU) and find that this will drive my 4.5 g servo quite happily - I have recieved a set of 9g Servos (SG 90 Tower) which function fine in my RC equipment, but now I want to drive them from my PSCU - no joy, the damn things just twitch. I've supplied plenty of power (7.4 V lipo to a single servo) through the PSCu and still just twitching. A similar 9g servo seems to work fine

Looking at the PSCU instructions, I can't work out why one make of servo would work and another not - clearly I'm missing something obvious

 

Help !

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Have you tried it with less
Have you tried it with less voltage? I’ve found that a lot of servos are very picky about the voltage, and get very twitchy when more than 6v or so is used.