Last update from me as I've achieved what I set out to do and now have plenty of positive feedback.
Anyone looking to do the same, here's what I learned:
The real aim of the game is actually the opposite, it's for
you to leave the SP positive feedback. As long as the SP is reasonably active on AW, they will more than likely return the favour.
1. Regardless of whether you do the booking over text or AW, send the SP a booking request on AW
before the meet.
2. After the meet if the SP hasn't confirmed the booking let them know you had a great time and wanted to leave some positive feedback. (They need to confirm the booking to leave positive feedback, else your feedback will be marked "FEEDBACK-ONLY", which isn't desirable)
3. Once the booking is confirmed, leave some positive feedback and don't be shy with the flattery.
Happy punting lads