My friend I have nothing to share about bounties because I am in same position as you ,many rewards from bounties never get listed on exchanges till date but the best bounty I detect this year so far is miracle tele and veil
For me I felt is just a matter of proper research and knowing the team involved in that project,that maybe can give a little hint if the project will go far or not, over the period I involved in bounty I have only benefit little.