Do you base grind all your new skis? Who do you have do the work? Hand edges, or machine?
When I buy new (or used) skis I check them and then do what is needed to get them tuned where I want them. Sometimes this requires I get the bases ground flat at a local shop. Rarely, I'll have a local shop do the actual tuning.
For the actual tuning: 99% of the time I do it myself with hand tuning tools. Main tools are Beast & Skivisions tools. Tognar & The Raceplace are my primary sources for tools because they are local and trustworthy.
When I do have a shop do the tuning it has been for used skis that I've bought that were in bad shape - needing multiple rounds between the grinder & benchwork. In recent years, I've only acquired two or three pairs of used skis that were in that bad of shape.
Also, if I do have a shop do the tune, I'll usually have them do a .5 or .75 base (whichever their machine can do consistently) and 3 side. If that later proves to be too aggressive for the particular ski design then it's easy for me to knock the base edges down to a 1 base.
In any case, even if I have a shop tune my skis I almost always end up having to spend some time refining their tune to suit my needs or "fixing" their attempt to de-tune the skis - even though I wrote on the work tag "DON'T DETUNE!!!".
I wish ski manufacturers would offer performance skis with ski base graphics that showed "NEVER DETUNE" or "DETUNE & U DIE" in huge bright letters.