If you’re still getting sediment and corrosion products coming out, then in a way that’s good… the blockages are getting cleared. However, it’s possible that some of that gunk is blocking a rad leak, and you might find yourself with a pinhole somewhere along the way. The tubes in the radiator core are small, and it can take a long time to get everything out – that’s why the ‘standard’ process for clearing a radiator is to remove one or both tanks and to jam rods through the core tubes until the sediment is out. This is obviously labor intensive as well as being hard on the core if it’s done without the required care.
Early in my Tiger ownership I had the radiator rebuilt with a four-row core. It is mounted so that the stock shroud still fits, and I previously used the ‘Canadian’ six-blade fan… I’m going to try and only use an electric fan this time around and see what happens. The four-row rad is heavy and I now think that a two-row aluminum radiator would be as efficient and about half the weight.