Those straps are fine, the space is there to keep it tensioned, don't overtighten as you can strip the thread, really need to balance out the bolts so that the strap at the rear is just touching but with more space than your current forward one, the reason you have the rear of the strap just touching is with your current gap the main sheet will get caught in the gap causing some mayhem. Great looking boat by the way.
Aus 5.8's have gone square so if your looking for a near new pintop main there are a few out there with not much work like mine with only 14 days use for Aus$500