Hi Max
For inshore I agree with Andrew.
If you can get a big tide with low an hour after dawn,fish the last of the run out or first of the run in, low light no boat traffic, current around structure....should be a good chance.
As well asking divers,there is a lot in common with spanish mackerel. Most good spano spots hold GTs, either in closer or up current of the spanos.
For inshore, boat traffic and bright sunny days seem to be the fun killers