I didn't mind whoopies but it annoyed me that you had to throw on the tree straps, Marlin Spike hitch, then whoopie onto the hitch & on top of all that you'd lose 50cm at each end.
So out of pure lazyness I can up with this
From the fixed loop and I added an extra 25cm between the end of the loop bury & the exit point of the adjustable loop. I reeved a 35cm piece of webbing to serve as tree protection
Then added an 2nd 35cm piece for more protection but can also be pushed out of the way if not needed
This is the set up with the main piece only being used, 2nd pushed away
Set up using both pieces of protection
They're adjustable from 25cm to 2 metres not including the tree strap portion.
I'll be buying some more Amsteel to make 2 large continuous loops for extension slings & 2 x 1 metre pieces of webbing in the event the only suitable trees are huge or over 5m apart.