Maybe combine lappack and jetpack + increase engine power 30% (height limit 256) and energy consumption 50% more. It's will be 300 000 eu and can supply power electric tool. This is very convenient.
exactly what I was about to suggest, basically a cheaper, lower tiered version of the gravitation chestplate
I also wanted to suggest maybe a change to the advanced tools.
for an advanced item, they still kind of lack the advanced feeling for me.
it'd be kind of boring to suggest something like a 3x3x1 dig function for the drill for example. but I was thinking of something similar to that.
for example I was thinking of a right click ability for the advanced mining drill, when right clicked you point the drill forwards, and you rush forwards aswell, drilling a few 2x1 blocks further.
this ability could also be used above ground, increasing the distance you rush forwards. it'd ofcourse consume some EU consumption, but it could be a good alternative to sprinting all the time.
for the advanced chainsaw I was thinking about a right click charging ability. by holding right click with the chainsaw for a few seconds, you'd be charging your chainsaw for a more powerful move.
if you'd use it on a tree, it'd work similar to the axe of the stream of TC3, chopping the tree down from top to bottom, but only a few logs at a time. with mobs it'd provide a bigger damage and being able to block attacks.
maybe if you'd add modes to the Vajra you could perhaps make it so that with each mode it changes it's shape and appearance.