I use the Lexicon PCM bundle (which like the PCM 96 which I also own) really is not what most of us old timers would consider "the lexicon sound". The PCM plugs/PCM96 are really closer to a TC M3000/M4000 style of verb as they are very open, pristine and clear. They are great for those types of high quality verbs where you are not sure what the verb is doing to your sound until you take it away.
If you want to get the full Lexicon sound the idea is to mix it with the Leixon Effects bundle, it has delays pitch shifting, chorus and all that..http://www.lexiconpro.com/en/products/pcm-native-effects-plug-in-bundle
The Random Hall is the "lexicon sound" it is the one I use, the new Hall algorithm is a completely new algorithm made for the PCM96, I guess the new hall algorithm is more similiar to the TC reverbs cause it is more natural.
I just want to tell you all that, the Effects bundle exist, it is quite important when for instance we compare with Valhalla reverb which has pitch shifting.
Me personally when I make ambient music I tend to mix reverbs, I use toraverb and random hall a lot.. they complete each other.
If I use Valhalla shimmer and add the Lexicon afterwards in the chain it gives more 3D sound.
yes..so it is another advice..to mix reverbs..maybe you can use shorter tails but two reverbs.. experiment..
I have not tried the Lexicon Effect bundle myself, but I am sure if I had it I could get a more complete sound with just one reverb instead of mix.
Btw the Toraverb reminds me slightly of the Eventide reverb yet less metallic but it has plate characteristics..