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Hi Peter
Try unscrewing the locking screws all the way back, and then pull the mirror back towards the bottom of the scope with the collimating screws, one at a time, a turn or two each at a time. This should compress the springs to where they are giving stronger support to the mirror and the compression should mean sag is reduced. I know someone who would screw one back until the spring at that screw was fully compressed, then just use the other two to collimate. I don't go that far - I like having three screws with adjustment, but I like to keep the springs under good compression.
This will drop your focus point a bit deeper into the focusser. Hopefully there is sufficient in-travel on all of your eyepeices before you pull the primary mirror back down the tube.
Bunnings have a good range of compression springs. There are some suppliers retro-fitting these scopes - usually sold as a package with better knobs?
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