I just spent the past 3 days on a Hitachi 160 rubber duck with rototilt filling in behind curbs and prepping for sod. The Hitachi 160 does not have enough counterweight for the rototilt. At full extension over the side (and even before), the wheels wanted to lift off if movements weren´t slow enough. Not really ideal if you´re trying to make time.
I understand your comments and can simpathise :yup
Did you by any chance take a picture of the machine? I wouldn't mind betting it has a standard or what some would call a long stick ( dipper arm).
You add another 2' ( 500 mm ) plus the additional weight by adding that head, the extra reach is great but as you found it unbalances the machine.
I was a bit upset when my duck arrived as it had a short stick ( apart from a few other things like 4 legs) but thats been covered else where
the machine was spec'd and piped for a rotator as it was originaly going to a part of the world where they cant operate without one :stirthepot as a result it would end up with the same sort of reach as I am accustomed to without compromising stability.
In these pictures compare the top mounting of the bucket ram to see the difference 1st two are Terex Atlas 3rd is Zaxis 140 :drinkup