Games like this always have grind.
Buy telemetries and pass the weapon you're upgrading around alts to maximise bounties. It'll speed things up considerably.
I'm currently leveling my first (and only due to time) alt. She's at 15 now and once I get her to 20 I have the gear to get her to 29 immediately. Should happen this weekend. I'll probably pass the Horn around, but I got so many legendary and a few exotic weapons for her that I need to level those up to use her in the raid.
I don't want to have to constantly have to transfer things in the vault. While I got my 3rd VoC last night, I didn't mind it since I needed it for my alt. Regret sharding my 2nd and my original Voidfang Vestments.
One thing I'm annoyed at is that lately the bounties have had low XP returns. And while I still love playing the game, especially weeklies, Nightfall and Raid, I'm getting kinda burned out on the daily bounty grind. I'm now only doing 3 per day that I can do quickly while doing the daily story and public event.
With Dragon Age approaching, I'm going to have a hard time dividing my limited free time between both games.