At the risk of adding to Brion's comments I do have some thoughts.
He is quite correct that once you are set up adjustments are all about headsail luff sag.
I haven't sailed a PSC34. If they are anything like the bigger PSCs your mast is a tree trunk and any concept of mast bend is a fantasy. With the Solent stay you will only be flying one headsail at a time so if you get the static loads reasonably even wind loading will do the rest, together with the backstay adjuster. Depending on what furler you have you will probably want to ease the backstay to make furling require less effort.
If you can accurately estimate luff sag from the cockpit you are a better sailor than me. I go up and sight along the luff before I declare success.
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