I think a key thing to note is that both pets will be casting the blind proc if being used and pet tanking should be a more valid method of combat, doesn't help if you pull lots of adds... but then nothing really should.
Think you've gotten a little confused, you cast the nano on the target, this turns THEM into the bomb, depending on their runspeed the count down gets shorter (so fixers will tend to give the shortest countdown), at the end of the countdown the person you hit with it will "explode" for the upto 5k damage aoe to all your enemys around them.
This means that basically no matter who you cast it on the distance they can move before they blow up comes out more equal, faster people will get further in a shorter time but blow up sooner, slower people will take longer to run away but get longer. If they don't run, well they get a heavy hit to them and their friends allowing for you and your friends to mop em up while hurt.
Even if they do run, they'll still get hit but hopefully have limited the damage from the aoe AND have escaped combat to prevent them getting finished up after the large almost assured capped hit.
Every time the pet hits, it will do an additional hit of 200 damage. So if your pet hits for 1000 damage it will be "Pet hit Mob for 1000 <soandso> damage Pet hit Mob for 200 points of Melee nano damage"
Not sure if there will be any clouds around people, but it wont make their screens go black when hit for it. However I would point out ALL of the new pet procs are 100% on hit. If your pet has hit them, they have the proc on them.
Oh and jerusha, leave hacking to the fixers!
Use a Field Quantum Physics All-Purpose Tool on them instead, to redesign the kits to use ME and quantum physics to use. Build and redesign! Your engineers!