Most AMP girls would probably be more than happy to get you off via L2, either CBJ or BBBJ depending on the girl.
Unlike suburban spas, at AMP's you're tipping the girl for her time and not the level of service because FS is always expected at AMP's. Therefore, the same tip would apply whether you got off via L1, L2, L3.
Some experienced girls may even give back some tip $$; or if you announce your intentions prior to the festivities, they may not take the entire amount. But I wouldn't count on it.
That being said, when I first started going to AMP's after moving to this area, I inquired about that very thing. I was told that for L1 you would tip the amount of the house fee, 40 or 60. For L2 you would up the ante of the tip to 80 or 100 and for FS you would obviously tip the full amount.
Not sure if the above is still practiced and I can't remember where or who told me this.
From my experience, I wouldn't consider tipping anything less than the full amount regardless of the service I requested.
My advice - either tip the FS amount and hope for the best or continue searching for L2 providers at suburban spas.
As always, the views above do not represent the views of this board or for that matter, probably the majority of the members - LOL
Just MHO.
K.