03 escape uncomfortable vibration and clunking

The cheapest and least frustrating method to follow myself is:
Have the whole driveshaft taken off and drive for a while without it.If the vibration is gone then you will know that the problem is either shaft balancing related as martin-csr said or U-joints related despite the fact they are new.
When the vibration occurs do you sense any up and down feeling on your body or a sideways one?If any of these feelings is evident then your front half shafts need some attendance.
Please let us know of your findings.

PS.lease, forgive me for mentioning this, but is there enough oil in the engine?

That is very true.
That is why one of the first questions in these situations isoes the vibration persists even when coasting at the same speed in neutral?
If no difference in vibration the culprit is somewhere in the drive line or rims and tires.
If the vibration goes away the engine or the transmission need some tending to, with the corresponding mounts.

I'm really :cuss: at places like that.
If the wheel was obviously bouncing on the machine then, the rim is at fault and not the wheel balancing. I don't know how old the rims are but all it takes for them aluminum wheels to get strembled is one single pot hole at high speed.