Hi
@Petr and forum, I have 4 EZones 98, and somehow one is so underspec (feels super light) that playing with it gives me arm pain, I noticed one day that I started using it with fresh strings, it was giving me more vibrations and pain than my other EZoness that had same strings and tension on it. I noticed the discomfort and immediately switched back to one of the "good" racquets and pain went away.
Then I wanted to test my underspec racquet pain theory and I started to rotate with one rest day before using each racquet and the day I used the underspec MF, it was giving me signs of pain right away, whenever I started to feel it I switched to any of my other racquets and discomfort disappeared.
So, I would recommend changing to another EZone, but measure it before buying, make sure is with the correct spec and adequate swingweight (above 280 unstrung). Specifically for this racquet (and maybe others tooo), the more swingweight (to a level you can handle) the more comfortable it feels.
Question in general, has anyone experienced this phenomenon? Underspec racquet causing issues?