Threatening Presence is too weak. Especially in Delves.
I could use the Voidhunter but then I will not have access to Axe Toss interrupts
Seems fine to me, unless it dies and you resummon. He’ll rarely get aggro back in that case.
Hmm after a few more Delves I’ve realised that it’s not a Felguard problem. It’s a Delve mechanic. The mobs do chase me when they reach 5% health. And they stop attacking pets.
It’s really annoying
Aye. That´s why if emergency resummoning in fight when there´s no player tank present, it´s generally still a good Idea to use your Fel Domination to summon your voidwalker instead.
You’ll lose some dps and access to axe toss, but his AoE taunt can regain aggro much better than the Felguard can, esp if it 4-5-6- mobs as is often the case in delves. And you still have Shadowfury, Fear, and Mortal coil for emergency interrupts 
Yes, some of them do a hail mary shortly before death and just go straight for the player, but this has always been the case even in S1. I always assumed it was intended behavior to be honest, just to keep pet classes from being a total faceroll in delves, because hunters have the same issue, but player tanks do not.
Do not have problems till I hit t11. It is so annoying.