Changing to a wool blanket instead of a foam base sounds like a good idea. I use use a thick woolen blanket on my traditional press. I also have a new Epic Six letterpress made by Quick Kuts (it is part of their letterpress series.)
Its small and compact and great for making smaller prints. I have experimented with it and have found using 2 layers of felt along with the supplied plates makes a successful print. The only thing is you can't adjust the height of the roller - I get around this by using more or less felt.
Hope this helps!!