That was true at 75 and maybe a bit beyond.
Howvever, with advent of Ruinator - an extremely powerful BST WS, the ability to hit 2-8 times in the offhand shoots Beastmaster's DPS through the roof so long as you can hit the target mobs fairly often (Works on DC Dyna mobs very effectively - you don't tend to fight much higher than that on BST).
I don't think Octave is a good idea for BST for a few reasons;
- Master's level effects pet's level, and a lower level pet can harshly effect damage output as well as tanking capability
- Plentiful Exp is handed to you in almost every event, you would have to regularly de-level yourself
- Club skill at 99 is low enough on BST, it would be even lower at 96 (16 acc difference between 96 and 99)
- Inaccessable gear 97+ that works well with a Kraken club build (acc and sTP)
- If you do end up fighting higher level targets for some reason, your damage output will be very poor, regardless of your Weapon choices.