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It would appear that none of the stars are actually round but have tails pointing out to the say 2pm position if imagining a clock face. Fast newts can be difficult to collimate. Are you setting it up so the centre circle is slightly offset in the cheshire as per the photos of a f4 in Astrobaby's collimation instruction pictorial? You don't want the donut centred in the focuser tube for that scope. What alt angle are you using to collimate the scope? Some scopes exhibit collimation movement (due to flex and mirror movement) at different angles, good practice is to collimate at the angle you most often view, or image at. So 45 degress is a good starting point. You may also find the upgrading the GSO springs will reduce or stop any change in collimation through different angles. Good luck.
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