I always give the HS stock a full and proper bedding job. I use a rotary burr to remove some of the ali stock, then commence bedding.
The problem with a light shim of bedding compound is that the fine layer lacks strength and consistency (regardless of brand). In most cases, the job also ends up sitting too high and the whole job has to be done all over again.
If you try to go even further, adding a small blob of compound to the recoil lug area, the results can be unpredictable. The job can end up with pinch points or again, can end up to brittle.
Either do a full bedding job, or shape the ali to a perfect fit.
If you want to go minimalist, Araldyte (5min epoxy) the action to the ali block. To do this, prep the action with a release agent (even car wax will do), apply a small amount of epoxy to the bedding platform, fit the action, screw it in place and leave it. With this method, the rifle will be accurate but you cannot dissasemble the rifle for cleaning regularly. Each time you disassemble it, you will have to clean up the epoxy and start over.
Like I say, my preference is to do the job properly so that it lasts for many years. I don't have my HS stock in bits at the moment but the pic supplied is identical to how I go about the job (actually my wife did this bedding job, she is a pro with the M700's). I wrote a full bedding tutorial a while back and published it online. If you get a chance, have a read:
Hope that helps. Nathan.