I know where you're coming from Lizzie. I too was absolutely hopeless with the Redwood and Ghost, after their initial stellar performances. They were much like the new manager arriving to save the football club from relegation, an initial boost before returning to true form within days.
Both of the named putters have, as far as I am concerned, crazy meter speeds. Way too hot for my rapidly slowing reactions. The Rossa however, is a different animal altogether, akin to a leisurely punt along the Cam on a summers day. The Callaway balls make that journey all the sweeter, providing the strawberries and cream for the journey.
Horses for courses I suppose. The "young team" with a verve for fast living, Silverstone and Just For Men, opt for the Redwood. Those of us with a hand cranked Model T, grey hair and Beta Blockers, swear by the Rossa.