Aaah the dreaded weather helm ....
If you haven't viewed Kid Peel

zip to the start of the close haul segment where 11 year old William is operating at nearly no weather helm running around 5.7 +kts.

It would be really interesting to see ,using a fish scale say for example, just how many pounds is required to point optimally under good wind conditions runing around 5.5kts.

I add this into the discussion as there have been comments that the J30 is not a kid boat and is tiring to sail close haul for most gals. Are we are talking about a very narrow tuning/wind-speed range? that may be related to mast step offset? {also consider that 505 has a modified rudder to somewhat offset weather helm}

later this week Brian J30 #22 and I will be shortening the forestay perhaps as much as 1.5 in. to get some of the wobble out of the forestay. Notice I am not saying sag, but wobble.

we will do the whole thing with back stay and shrouds off. I'm thinking tuning the lowers first to establish a "fixed" point in regard to the forestay ... In othe rwords basically tuning to a forestay length geared to eliminating wobble but a reasonably straight mast.