Tanking on a Juggernaut is like trying to dig a 3 foot hole in the mud with your hands. Sure you can do it, but it's messy, it'll take you longer and requires more effort. Or you can go get yourself a nice shovel (Bounty Hunter) and get it dug faster and more efficiently.
You really shouldn't get used to using a hybrid build. I believe Bioware stated that they don't want hybrid builds to be viable; they seem to want people to put at least 31 in their tree of choice.
I mean if you want to use it then feel free, but don't expect to be performing at your full potential.
If you look in your ability book, it tells you what is ranged and what is tech. For example, Rocket Punch is a tech attack and Flame Burst is a tech attack. The only ranged attacks I'm aware of for Powertech are Rapid Shots, Rail Shot, and Unload.