Sorry to intervene but I think its understood that anytime you open the system, you must evacuate the system before recharging it.
Such a simple priciple is taken for granted. If you change the compressor by yourself, its assumed that you are a good home mechanic and you know the priciple of AC and therefore you must know that you have to vac the system.

Now I am not trying to put anyone down or question your abilities, all I am trying to sya is there are certain things which are taken for granted as undertood.

No hard feelings.
MVK

__________________
One penny saved is three penny earned.

1985 300D Turbo 179,000miles

May as well "step in it" on this post. Noise may ice in system as you failed to evacuate the system which is done for only one reason, to remove all water.
Also I don't see a mention of you replacing the clutch on the new compressor. This may have been the only thing wrong in the first place. Bad clutch will usually make more noise with the A/C off than when engaged but either way they will make quite a bit of noise. And the last thing no matter what is this system was never designed to run the extra high pressure of 134a. You have almost doubled the normal operating pressure your system was designed for. If the clutch was weak to begin with it will be toast before you know it.
Now to light the fire (so to speaK) under Larry B and Greg you should suck all the 134 out and evacuate for a good hour or two, longer the better. Then if you can buy it use r12 to refill. If not use Duarcool r12a. Yes it burns, but so does oil, diesel fuel, brake fluid, plastic etc. You will drop the head pressure by at least half.