After some thought here is my opinion based on posts and photos/graphics of structure posted here.....thanks alpinord, doctor d...
I ran my finger along all edges as I always do before skiing. Detected no burrs.
Skis grabbed, wobbled and were generally unskiable. SMJ brought back to shop, shop measured base bevel as nearly flat, ground a base bevel into skis iaw factory spec and returned them to us.
Different, not as grabby, but still unskiable. Now would not hold an edge on frozen granular.
Shop hand tuned, returned skis again, now ski very similar to SMJ brand new skis, same length model.
As I prepped my 170 RX 8's for summer storage I viewed the structure on both bases(170's still have factory tune, never ground) and bases on both are now nearly identical. Viewing the photos kindly provided by alpinord, the structure on the 175's previous to hand tune looked like a warm snow grind.
Thus I believe the problem was a combination of near flat base bevel and grossly improper structure for the conditions.
As a result of this troubling experience, I will never have a ski ground again.....I will always ski factory tune. Any ski becomes base damaged, edges rounded or otherwise requiring anything more that my diligent waxing and deburring?
It will go on ebay.
Now I have a continuing excuse for always having new skis
I remain curious(tho will never know the answer of course) as to how many skiers of limited experience and skills are rendered unlikely to get any better because of poor or inappropriate tunes?
Something I have never considered before, but as a nearly 10 year veteran ski pro should have. How many students did I miss the MA on blaming stance and balance flaws for poor technique when equipment should have been checked and considered as a factor? I could barely make a level 6 turn on these skis tuned the way they were. Luckily for me I was wise enough and had enough skill and experience to know the difference. How many others cannot identify equipment as the source of the problem in their skiing? How many skiers are as blessed as most of us are to nearly always be on new or hand tuned high end gear?
When I start to teach skiing again( which I plan to do once I retire from day job) it will be something I intend to learn more about.
Something to think about and discuss?