Cat22,I draw 29" and tuned a set of .400 spined arrows,30" long, for a bow that is 45# at my draw.It took about 260 grs of point and insert weight combined,to get them to fly properly.2" less shaft length would stiffen the dynamic spine app. 10 lbs and that would require another 30-50 grains of weight on the front end to bring them back into tune.If you can go to a thinner sideplate,do it.1/16" thickness in a sideplate can change dynamic spine 3-5 lbs or so.Your bow may require a different point weight than mine but this example should give you an idea how far you are off.
Go to bowmaker.net,read the tuning information and take it to heart.The arrow is far more important in this equation than the bow.If you plan to hunt,poor arrow flight from an untuned setup will squander a lot of your bows energy that should have been delivered on target.A well tuned arrow will be the most forgiving of errors in form and hence,will be more accurate.
Personally,I don't scrimp on arrows or tuning.It is way too important.This doesn't mean you have to get expensive arrows but when you need different spined shafts,fork over.
If those bows were mine,I would tune a set of arrows to the 45 lber and then build out the side plate on the 50 lb bow till arrow flight would be perfect.I have a 48# and 53# bow,that use the same arrows just by tuning the arrows to the lighter bow and building out the sideplate on the heavier.
You can try going to heavier point weights but my guess is,you will need close to 300 grains on the front end to bring those into tune.