Johan,
You mentioned that you considered it a disadvantage not using poles, and I am not sure that I fully agree. Obviously, on one level being comfortable using poles is one factor. But in the past when I did a few races in the Alps (2013–2017), I never used poles and given my experience using them now, I still would not have used them at that time. Using them now at 60 is a different discussion, but I should add that at that time, like you, I would also typically be in the top 5% in my A races and 10% in B races. The main reason for no poles is that at that time, uphills and specifically uphill power-hiking – pushing with hands on thighs – were one of my main strengths and I passed people rather than being passed. I would lose places on downhills instead.
First, power-hiking felt most natural for me and I felt it easier to transition in and out of running (other running acquaintances do not find this natural), and second I had the muscular endurance for it, in part because I targeted some of my training for it. I live at sea level and only have a little ski hill to train on with 46 m with about 300 m or so distance; better than nothing but not super helpful for alpine climbs and boring after 20 reps. But I would practice transitioning back and forth between running the bottom 2/3 into power-hiking mode for the top 1/3. In the winter I would do a spinning session every week or two, often choosing an interval session: 10-15 min warm-up then 30-60 intervals mixing high cadence, slow grind, standing, and heavy seated grind that mimicking power-hiking with hands pushing on thighs, and after each interval jumping off and doing 10 squats, lunges or jump squats with 10-15 kg, 1-2 min recovery then next interval. Typically 10 intervals, then filling out the time to 1 hour. Sometimes I might just do it as an alpine climb and after warming up slowly increasing resistance every 2 min until I was in power-hiking mode, then working my way back down; again aiming for a total session of 1 hour. I aimed for one proper gym strength session per week, mainly doing heavy weights with few reps, plus tacking on 1-2 lighter weight sessions during the week onto the back of my morning run commute. Finally, 6 and 3-4 weeks out from the race, driving 2+ hours to a ski hill with 250 m vert over 1.5 km service road, mainly for conditioning my quads for the downhills and not so much for uphills.
Don’t know if this would be any help.
/rich