Fixing Steep

I am working very hard to fix my steep but not really over the top back swing. I am doing many different drills to correct this and I am seeing progress. When I have corrected the steep and have the proper path into the ball what improvements might I expect to see. On average, will my distance improve? Approximately how much. I know it will depend on other factors but what improvement is normal for most people that correct this swing flaw? Thanks Frank