Weight vs ski length is a good point. I am 82 kg on 200 cm Gammes (80-95 kg Åsnes weight recommendation). With that combo, I can make large arc turns at slow speeds of 10 km/h or less. Maybe turnability is a point for the Åsnes ”soft” sizing guides?
Last two sessions, 10-15 km/h has been enough to start doing parallel turns at tight spots (images). More precisely, they were wedge christies at the tight spots with uneven ground. A short wedge to turn the lead ski at turn initiation helped. In diagram below, teo peak runs are above photo slope runs (gray is altitude).
The parallels came by gut instinct, when I started to pay more attention to weighting and unweighting. I guess I had the unweighting in muscle memory from a few seasons alpine downhill as a kid.
By the way, as others say, tele shuffle (directly to fall line) is a great exercise, and also even when you can link turns already. It helps to get rear ski pressuring right. I did it today at a 5 degrees slope part before actual ”piste” started. Pressuring both rear foot ball of foot against ski and shins against boots helped to carve sharper turns (another photo).
When pressuring rear ski, you need to still keep the front ski edging trick I guess. Yet good rear ski technique makes turns better with Gamme too, as long as you do not forget the front ski things.