The H in HSE stands for Hovland, an expensive, high quality film cap that Albert voiced the speaker for. I'd leave them alone. They don't age much, and its more likely you'll throw the voicing off.
I liked my HSEs a lot, and had to triple the $ to do better.
BTW, I have a brand new midrange for that speaker if you want a spare. PM me if interested. The tweeters and woofers are available, but the mids are pure unobtanium.