However, in the absence of a buff, there are things WE can do to improve the survivability and damage of our Phantasm.
Obviously, there's Overwhelming Force KB>KD.
There are Pet Damage and Recharge Intensive Pet special IOs to increase his defense and damage resistance.
At level 50 there are Destiny and Hybrid powers that can help our pets.
There are also a couple of options to assist in the Power Pools and Epic Pools, including Damage Resistance Debuffs, Leadership powers, and even Medicine powers.
Like I said, even with all that available, I would also still appreciate improvements to Phantasm's AI, but the above options can help some in the meantime.