my first 742 case rebuild, need alittle advice please

OK thanks yes that makes sense and that's how I'm doing it I have not installed any front shims yet just the one at the pinion head I just thought I would see more movement on the pattern with my decrease in shim but if you think 10 thou will make a difference then I will take only 10 more out I posted some pics hopefully they work I always have trouble posting pics on this forum thanks again