I've just finished making my first ever cloth tent. My current Weaver skill is 100 and I noticed that when applying Flax Construction Bolts I required 3x the number required to make the tent. That is, a tent needs 25 Bolts but my skill level meant I had to actually make and apply 75 Bolts (3:1 ratio). At what skill level will the ratio drop to 2:1? Is it 150?