First and foremost here, it's important to note that the 'GASS' and 'Green Line' are different
rods even though same brand, length, and line class.
bogbrook; I recognize your intent for this rod now, it's just so much more common for folks to be fishing sink tips*. The rod is definitely more fickle with floating type Scan heads.
'Scandi Body' 8/9 - 23' and 425 grain. Add 10' In-Touch 9wt Tip at 96 grain = 521 grains at 33' -
These tips are available in floating as well as multiple densities of sinking.
I bought Airflo Compact Scandis in 510gr and 540gr.. One felt a tad light, the other a tad heavy (go figure!) Of the two, for fishing
, I would have chose the 540gr.
Airflo's 'Rage' head might
be an option.. 29' - 30' head then run a good Poly leader to smooth it up some.
Also tried RIO
's 'AFS' in an 8/9 - 520gr and 38.5' plus 15' Poly.. Got some impressive hero casts, BUT this from less than knee deep water. Met friends later for fishing and head combo was to long for the deep wading we had. Both friends better casters than me and each of them struggled with combo as well.
The common denominator here (for me) was 520 - 530 grain range.
*I ran a 550gr RIO
Skagit on mine with tips and got along great. A little quicker casting stroke than disciplined Skagit style but right at home for folks familiar with Scandi heads.
Best of luck