Seeking minor/inexpensive tweaks and if a different mat may or may not provide any perceptible improvement.
lewm, that is a two part question.
Part a) "seeking minor/inexpensive tweaks" and
Part b) "if a different mat may or may not provide any perceptible improvement."
The mat question was answered in the first three posts. That leaves "minor/inexpensive tweaks" which can go on forever.