Let me give you an idea to try. Go to a fabric shop and ask for a fabric called "pocket drill". It is a very good patch material. It may feel just a bit thick but after washing, it has a wonderful compressability that will fill the rifling in your rifle very nicely. Just buy the minimum to try it. When you see how well it works with your present .530 balls, go back and buy a bunch. Take it home and wash it with no fabric softener. Two washings is best but you can get away with one. You can dry it in your dryer but I find that I get the best results by line drying it. Then run over it with a steam iron to get out the wrinkles. This just makes it easier to cut into patches. You can either use an arch punch to pre-cut your patches or just use scissors to cut square patches. Either works just fine and will make no difference in your accuracy. Or, if you prefer, you can cut your patches at the muzzle. I prefer to use straight Ballistol as my lube of choice but you use whatever lube you prefer.
You will probably still have to use a short starter with this load. If you want to get away from using a short starter, you will have to use either a thinner patch (not my favorite idea) or a smaller ball (again, not my favorite idea). Another idea would be to cone your barrel. You can do a search on The forum for "barrel coning" to find what is said and to find a source for a coning tool. I have coned some of my barrels and it makes no difference in the accuracy. It also did not make enough difference in the ease of loading, in my opinion, but that is its stated purpose. If you want, you can give it a try. It may or may not help you but is also won't do any harm.