Perfectly normal to have to adjust v-hold after a recap, but it sounds like the caps being slightly different is causing grief. If you're sure there's no happy middle ground for the v-hold pot, you might try replacing the electrolytics in the vertical deflection with ones that are right on the button, I guess, not just +/-20%. You can get a cheap component tester off eBay to test them, if you need one. Always use name brand like Panasonic, Nichicon, Rubycon or Nippon Chemi-Con. Kind of a longshot, but i can't think of anything else.