Colorspaces and data preservation when going in and out of L.A.B for color enhancement

There was a similar post 2 years ago which did not quite answer this specific question.
I am using a technique to enhance colors by converting to LAB and applying the image in an overlay or softlight blend. My images in RGB are all kept in ProPhoto colorspace. They are all in RAW format (specifically Nikon's .NEF). When I switch to LAB and then back to RGB, it appears that ProPhoto is replaced by sRGB colorspace.
I am then converting from sRGB back to ProPhoto.
In this process, am I losing color data as the gamut is squeezed into sRGB that does not return after going back to ProPhoto?

Hi Stan,
My first instinct is to ask how you're switching from Lab back to RGB. 
Your PS colour settings may have sRGB set as the default.  If you're simply choosing mode / RGB, it will convert your profile to sRGB from the Lab colour space. Definitely not what you're looking for. 
You have a couple of options if this is the case.  You can open up your colour settings window by choosing it from the main Edit menu.  Switch your default RGB setting to ProPhoto if this is what you prefer to use the majority of the time.  You can save various custom configurations and choose them when they suit the task at hand.
Also, instead of choosing mode / RGB you can choose 'convert to profile' from the main Edit menu and configure your conversion there.  I typically use prefer to use this approach since I can experiment with the various settings.  It also ensures that I'm converting to my intended profile.

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