Please explain with specifics. Step by step.
I may or may not have misunderstood your methodology so I will enumerate the steps how I would do the OP's original requirement from start to finish.1) Define your curve.
a) On the Add Adjustment Panel, select Curves which will add a new blank Curves layer.
b) Manually add points on each R, G, and B channel as needed, let's say 9 equidistant points with input/output values of 0, 32, 64, ...., 255. 2) Store the Curve as a preset.
Click on the drop-down menu on the right side of the Curve panel and select "Save Curves Preset." Give a name e.g. "9 Point Baseline Curve" or some such. Save it at an appropriate place. 3) Create the action to Repeat 1+2.
a) Go to Actions panel.
b) Click on the "Create New Actions" symbol at bottom (second from the right.) to open a pop-up window.
c) Name your action e.g. "Baseline Curves Layer w/ 9 points." Hit "Record."
d) Do 1a) i.e. add a new Curves layer
e) Open the Preset window at the top of the Curves graph and select the previously stored Curve Preset "9 Point Baseline Curve."
Now you have the curve applied to the layer.
f) Stop the recording by clicking on the grey square (first on the left) at the bottom of the Action Panel. Your new action is stored in the list on the Actions Panel.3. Recall the curve.
Whenever you need to use the curve, simply go to the list of your Actions and select the "Baseline Curves Layer w/ 9 Points" and click Play.
Hope this helps.
P.S. All of the above is based on PS CC 2014.