They do work. I'd suggest waiting a few days checking bounties. Get all the 5000 xp ones from Eris and the vanguard, stockpile them all. Once u have about 8 or 9 or even a full 10 bounty slot with completed 5000 xp bounties. Use the telemetry. But make sure everything else is maxed but the pocket infinity in your case. Do this on 2 characters(since u said u only have 2 telemetry) , if it's a day where there's a bunch of easy 2500 bounties you can complete them within the 30 mins, (telemetry lasts 30 mins) to get more xp. I know this works because I maxed out my eidolon ally in two days doing every bounty. Got the necrochasm. Haha. Gl