One thing I observe in my Hohners is that the reed gap is proportional to the reed size. As the reeds get larger, so does the gap. I think reducing the gap on all reeds to make them the same would be a mistake.
I have learned the hard way that you must be very careful when adjusting reeds. Where you do the bending along the length of the reed can impact how easily the reed bends I think. I have tried adjusting some low note reeds that got out tune due to blowing too hard to bend notes. By adjusting the reed gap, I got the notes back in tune, but now the notes bend too easily compared to the surrounding notes. I am still learning about the relationship between reed gap and bending point on the reed versus tuning and ease of bending.