Basically .. if Discerning Eye, Methodical, Discerning Eye, Methodical, Discerning Eye, Methodical does not cut it ... you are not likely going to be able to do it. That setup there gets you 450%, with two collection swings left.

Discerning Eye, Methodical, Discerning Eye, Methodical, Utmost Caution, Methodical, Utmost Caution, Methodical gets you 500% with one collection swing left.

Discerning Eye, Utmost Caution, Methodical, Discerning Eye, Utmost Caution, Methodical, Methodical, Methodical gets you the exact same place.

Discerning Eye, Utmost Caution, Instinctual, Discerning Eye, Utmost Caution, Instinctual, Methodical gets you anywhere 120-225 per Instinctual, for 240-450, plus 100 for the Methodical. Potentially the strongest routine you can do, really, and it gets you two collecting swings ... but relies heavily upon the RNG.

If you do not mind going over the 30 Wear "limit" you can always try Single Mind, Methodical, Single Mind, Methodical, Single Mind, Methodical, Methodical, Methodical, Methodical, Methodical. That would be 700% but leave you with a rather low chance of actually grabbing the item.

ALL of the things I've put forth here were based on having 600 GP, however. I'd strongly suggest that, if possible, you get more GP. I'm at 582 GP myself, I have to use food to reach the 600 mark - though I'd be better off with Perception food rather than GP food, you need to reach the 600 mark for most things that anyone would suggest.