We have two XR640s. One pretty much only runs wraps. I keep the heater on that one at default 104/108/130. I keep the heater settings a little lower on one that we use more for often for print/lam/cut stuff. Somewhere around 96/98/118. If we need it for wraps, I'll bump it back up to help the dry time. Believe it or not, it will make all the difference in the world on cut registration even over a couple feet. There's no science to any of my advice or printer heater settings. It's just what has worked for us.
Other tips... let your prints cool and cure. Don't lam a fresh run of warm vinyl. Also don't run your laminator with too much pressure. Not even a hair more than necessary. All those things will stretch your material - even slightly - and throw off your cuts. It doesn't take much.
Just last week, as a test for my crew, we ran 36" of decals on both printers at the same time. Pulled them both off and lammed pretty much right away and cut. The printer with the higher default settings was off registration from top to bottom on the print. The other printer with cooler settings was dead on perfect.
By the way, if you adjust your heater settings, be sure Versaworks knows to use the printer's heater settings.
With that said, I still say not to run more than 10 feet of print/lam/cut at a time if you can avoid it. On small decals with a precise cut, I would say keep it under 5 feet.