RIg tuning
Assuming you have a Loos gauge Model B, I would start with the Headstay turnbuckle 3/4" open (so that you have most of the available mast rake), then set the uppers to about 24 units, the fwd. lowers around 20 units, and the aft lowers around 16-18. It is VERY important that the aft lowers be looser than the fwd. lowers! You DON"T want reverse bend in the rig.
This is a reasonable setting for 5-12 knots of wind. For heavy air you can go as high as 28-29 units on the uppers, and 24 ish on the fwd lowers, 20 ish on tha aft lowers. If you don't have a backstay adjuster, I would set it up as tight as I can get it and leave it.
Once you have done this, look at your mainsail when trimmed up for upwind sailing. It should be fairly flat. If you feel it is too deep, tighten the fwd. lowers and backstay (if you can), and ease the aft. lowers some more.
Once you are in the ballpark feel free to check with me for fine tiuning tips.
Good times!
S