Well, I went and played with my alt for a bit. Started the lancer questline from Lv1 and between Road To 60, rested and armoury bonuses (catching up to Lv31 marauder) I was getting something like 500% EXP at Lv15. Went into levelling roulette as soon as I got to Lv16, came out at Lv22 and *still* had a small amount of rested EXP on the bar.