Ok, it is important not to tamper with the length of the wires labled "shorten these?" under any circumstances. the bridal wires are set at a structural length, any shorter and there will be a greater load on the bows pulling inwards. you don't want to stress your bows more than you have to.

so the "ladder" or chainplate shouldn't have to move at all. unless your not happy with your mast rake.

the wires "what about these" they are the whiskers, (very feline aye) are exactly what you want to shorten. by the looks of the previous photos your coming down about 150mm/6in which will be a lot of bend in the pole, if your worried about breaking the pole then you can suspend the pole below the bridal to make it straighter. does that make sense or would a photo help?

and no you cant raise the height of the spin bracket (spinnaker bale) because it is set a height not to break the top of the mast off. its a safety thing.