Surging Set
To be honest, I haven't quite worked with this set enough to completely figure it out.
A couple key things:
- stall the bag in clip and pull it slightly behind you before you set
- I like to think of surging as an arctic (frigidosis pixie) done behind you
- keep the stalling leg really in close to your body (I have my stalling knee touching the calf of my other leg)
- From here, it's a simlutaneous twist of the hips, twist of the shoulders, and pulling the stalling (dexing) leg away from your other leg and pointing that knee up and to the side - To help with cleanliness, make sure you are dexing with your upper leg (ie under your knee) rather than lower (ie ankle or calf). If you dexed with the lower leg, chances are you slurred the set. Good luck!
- watch Felix do them
Grifter
Make sure you have
very deep illusions and bubbas before attempting this one. You're going to have a very tough road trying to hit grifters clean or with good form (no pain) if you don't. If you're used to dexing illusions with your ankle (or shoe for that matter) then you are not ready for this trick. Practise illusions with a more far to close dex rather than side to side. It helps to have a very high and horizontal leg when dexing. Once you are able to dex above the ankle (better yet, the middle of the lower leg!) you can begin.

Good stretch for deep illusions:
1. stand facing a ledge, table or any elevated (strong) surface slightly above waist height
2. lift one leg, point that knee to the side and place the outside surface of the foot onto the elevated area (the inside surface is facing upwards)
3. Take some small steps backward with the 'ground' leg until you feel tension
4. Lower your forehead and try to touch the inside surface or your elevated foot. Go as far as you can and hold it for 20 seconds
5. Repeat with other leg
Ok, the trick...

(clipper set grifter)
A few points:
- set about waist height
- bring the dexing knee upwards as the bag rises
- dex the bag with the lower leg close to horizontal, going from |in front > behind| the bag rather than side to side - as you dex, do a good hop off the support foot. this helps you do many things:

get some extra height on the dex to pass over it cleanly

your body can pivot a lot easier in the air

gives time for you to twist your hips and rotate your support foot, so that the bag can get to your opposite side for the clipper
For a visual, watch my consec grifters in "Record Session" at the 6:44 mark. Dl it from my f.org gallery:
http://www.footbag.org/gallery/show/4561
Gonna go for a run or something. Will post more tips later.
Peace.