I will withhold judgment until I hear from Bob. The way you wrote the first sentence makes it sound like his reproduction is the first pad you see in your post that is all cracked badly, which at the end you say is the original pad - pretty misleading at the outset. First you say it was $700 and now you are saying it is $565? And you are saying it is wrapped in vinyl, not formed in a mold like all the other pads I have seen of his - why would he even spend the time to do that? And you are also saying another winter will kill it - you mean it isn't killed yet? I'm sorry, but this doesn't add up. I will find out more when I can get hold of him.
One other thought, it looks like you subject your pad to brutal conditions - do you ever use a protective shield available at most all parts stores? And it seems to me what might be said by Bob is that by not having your pad firmly attached to the dashframe with the proper clips, that under intense heat or cold, the pad is expanding and contracting excessively, leading to the problems you are apparently seeing? It just might be that silicone isn't enough to keep it in place so it does not expand excessively.