I believe those have reasonably light advance springs. Your advance may be all in at a relatively low rpm like you initially posted, but you still need to verify that.

The issue with those dizzy's is that they provide too much mechanical advance, which forces you to use less initial timing, which reduces your performance at lower rpm. They solution is to reduce the amount of mechanical advance by limiting the travel of the advance mechanisim itself. This allows you to have more initial timing, less mechanical advance and end up around 38 degrees total.

Once you have that squared away. They work nicely. You may want to find and keep a spare control module stashed in a ziplock bag in your trunk though.

If you're still not happy, you might also want to pull the heads, have them ported and decked to increase the compression, install a bigger cam, a bigger carb and a looser torque converter...