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I’m really not the best person to ask about that… All I really know is that spaces in URLS are frowned on, and for compatibility have to be escaped to ‘%20’ which just looks ugly and makes the url hard to read.
There are SEO people here who have far greater knowledge about such things, but I wonder if your SE rankings are already compromised because of the spaces?
maybe you won’t loose much by changing?
But I’ll bail here and see if someone else can contribute.