I have caught carp upto 10lb in the margins on my Z9 no4 with no problems, but i do also have the Z7 no4’s but never used them.
I biggest elastic i usually use is black hydro but i have now got some 16/18 latex in for the margins, using Silstar 0.20.
I am really happy with my Z9 and anyone that knows me will tell you i have had loads of top end poles and am always changing and swapping them but this one is staying put. (until the Z11 comes out anyway. lol)
The pole is light, responsive and rigid. It is a pleasure to use and in my opinion one of the best poles on the market and when you consider it costs £1750 compared to most flagship poles that are well over £2000 its a bargain.