really appreciate all the comments and tips
we loosen the backstay but have had the vang tight
also have centered the traveler so will try moving it to windward for more twist
also move crew to leward and that does help fill jib.
suspect we need to loosen lowers and tighten uppers to put bend in a little more. hard to gauge as we don't have one for rod rigging.
looking at chart looks as if maximum speed is at about 161 degrees downwind so will also concentrate on that.
will advise how all this works out
talking to North about replacement light 155
any ideas?