I can only give you my double-handing setting as that is the way I race most. When I race the boat solo I just use the same settings and just make the most of it, which seems to be pretty decent if I may say so myself.

I use (2-up)

50 mm spreader on 390 mm spreader arms (your Taipan arms are only 340 mm long you the reverse math equates this 50 mm to only 30 mm spreader rake

I use only 20 mm prebend I don't know what diamond tension I use, but spreader rake and prebend combined uniquely fix the diamond wires tension so I see no need to measure the diamond tension.

I went throught

First try : only 40 mm on 390 mm arms with lots of prebend (during DCC event) the boat was a dog upwind.

second try still 40 mm over 390 mm and 26 mm prebend : boat felt noticeably better

third try 50 mm over 390 and 27 m prebend : boat was a little better again, but only a little. Still my leech fell to lee too soon and hurt pointing. Boat was still flighty.

Fourth try 50 mm over 390 mm and 20 mm prebend : Boat was noticeable better at this time I was staying with the F18's on VMG. Boat still likes footing over pointing though. And it is flightly with less downhaul. Feels like I need to much downhaul.

In between I also reraked my mast forward and exchange some top battens. Exchanging the battens really helped and I raked my mast forward (when using the trapeze line measuring method) from "on the rearbeam" to 200 mm in front of the mainbeam. This raking forward really worked out well. Boat is more balances and less rooster tales at the rudders. especially singlehanding this raking forward was beneficial. I was really loading up my rudders too much.

This is how I ended last weekend. I think I can't get much smaller on my prebend (now 20 mm) as that was what the maker of my sail adviced as the minimal setting. But I do believe that I can rake my spreaders a little more aft and get the boat too accellerate more in the gusts instead of heeling. It would be really helpful if she accellerated rather than lifted as that would negate some of the work on the mainsheet that she now requires. I guess that alot of spreader rake is a good thing when you race singlehanded as that keeps you powerup in the light stuff but helps depower the rig in the strong stuff and gusts. Something I'm still lacking now or rather I handle the rough stuff with lots of sheeting action which works but is also very tiring.

So I think I will make 1-up and 2-up settings depart from one-another. I think I'll stick with 20 mm prebend but try 60 over 390 mm spreader rake for double handed sailing as here it feel like the current settings are close to what I want. For 1-up sailing I'm thinkg more along the lines of 80 over 390 mm spreader rake and detensioning the diamond to end up at 20 mm prebend again.

Conversion table for my spreader rake to that of AHPC taipan with shorter arms is

Typhoon to Taipan
53 over 390 mm = 30 over 340 mm
64 over 390 mm = 40 over 340 mm
76 over 390 mm = 50 over 340 mm
87 over 390 mm = 60 over 340 mm
99 over 390 mm = 70 over 240 mm

Summary

My redhead mainsail (2003) feels good now with 50 mm over 390 and 20 mm prebend. When singlehanding, it has good speed with these settings but I think 80 over 390 mm spreader rake and 20 mm prebend would be an improvement in 1-up sailing.

Eric, tell my about the difference between your sloop main and catrigged main. See the other thread on this forum.

WOuter