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75cm or 90cm speargun for reef fishing?

Thread Status: Hello , There was no answer in this thread for more than 60 days.
It can take a long time to get an up-to-date response or contact with relevant users.
What thick and length shaft did you use for these 2? I am planning similar use of 1 gun 90 or 100cm. Dual 14 or 16 rubber.

6.5mm for both shafts, one is a 140 the other one is a 118( I cut an old slightly bent 140)
For dual 14mm bands 6.75mm should work ok too, that's what my Apnea ST60 came with. RA spec. 7.5mm spears for their 2x16mm Tuna model - they tend go a little thicker than most. I would guess that they spec. 7mm for 2x14mm ( as they do for their 1x20mm offering - by contrast, my Omer's came with 6.3mm spears for 1x18mm screw-on bands, superlight).