Driveshaft-Differential problem

[The Hamsterball]

Hi..

I have done the S14 VLSD swap into my S13 a while ago, it fixed a lot of the noise problems I was having with my clunky open diff which had play in the output shafts (no good).

Now, I don't get any of the insanely loud clunks that I used to get with the Open diff, but I still have some noise. It's the same noise as before, but not as loud.
*ClunK*

If I shift and engage too fast, *clunk*
If i let out the clutch too fast in 1st when trying to engage (without using any gas), it clunks.
If I drive PERFECTLY and engage in every gear slowly and with an exact match, no noise*


I have been in a friend's S13, who drives no where as carefully as me, and there is absoulutely no noise.



I know that my non-abs S13 driveshaft is .75'' longer than an S14 ABS driveshaft (i believe).

I would like to know if that has something to do with the problem? Should I get an S13/S14 ABS driveshaft welded somewhere?

Or if the .75'' lenght difference doesn't matter, where else should I check, what else should i grease up, what should i do to fix this noise?