Just dont use Spacebar, but Q and E for individual hooks. This way you can also control the duration they stay hooked and reel yourself in.
In the last version I was just hooking on their necks, like Armin did when he stabbed Eren.
http://www.mangareader.net/shingeki-no-kyojin/10/189.
Then just reel yourself in, and start hacking away till you get the kill. Just watch out for the arm-on-neck smash which you can evade by releasing one of the hooks.
This version makes things hard again because of insta-kill eating that all titans now have. Unlike the arm smash, this is very hard to evade, especially with the 3-5 meter class. The deviants aren't that big of a deal, I take them out with pretty much the same tehnique like everyone else, it's just a bit harder though
My overall 3DM usage is getting a lot better, precision in controling the direction and speed of midair movement now alows me to roam the district almost without smashing at buildings, falling at the floor or simply loosing momentum.. xD
But still, geting those cool looking, high damage kills while moving in high speeds is very very hard.