almost everyone wears helmets (including me after measuring my speed)
Please be aware that your helmet is only tested up to 14 mph (about 23 kph). Whilst they have helped reduce head injuries from glancing blows from what I read they have done little to reduce serious head trauma injuries (concussion, skull fracture, death).
My view: wear one. Ski like you aren't.
On the stability at speed... using Ski Tracks I suspect you'll quickly see that the amount of time you spend at the higher end of your speed range is very limited. Probably no more than a few seconds per day. At the level of your skiing (as posted for MA in Ski School forum) you are probably better off staying with more compliant skis than switching to stiffer GS skis. With respect you are not currently working the skis hard enough to generate the kind of forces likely to cause issues.
I should add: if you want more stability for the current skis, use a more athletic stance/active balance as discussed in the MA.
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