I order my Davinci syrup online - much better variety (Netrition). Also, when i make the orange creamsicle shake I use Diet Rite Orange (with splenda) plus a bit of orange flavoring. Makes a huge difference - I also add a small splash of vanilla to smooth it out. (no pun intended!)
One that really works for me - because i can incorporate Coconut Oil easily is:

Protein powder
l-leucine
2 T cream
1 Heaping T of Cocoa (good quality, dark)
1 oz or so of Davinci's IRISH CREAM sugar free
1+ T of coconut oil (nutiva)
1 egg (or two if I'm really hungry)
I then mix it in the blender with about 2/3 cup ice
then add club soda /seltzer water (I prefer seltzer - no sodium)
give it a last whirl...

this might be my favorite - the addition of the coconut oil really tides me over