This is what I did to my stand because I felt the same way you do about it. I got some really flat 4x4’s and made a frame for the top and bottom. Then, I put them together and attached them to the stand with some small corner brackets. This was mainly done to add some height to make more room for my sump.
Then, the lighter pieces of wood are pieces that I added for strength. I measured and cut each piece to fit tightly in between the top and bottom. Then, I used wood screws that were long enough to go a little more than halfway through them from the inside of the tank so there were no screws showing. There are five screws holding on each support. There are four supports on the front, four supports on the back, and two supports on each side. I think that the supports were something around a 3/4”x4” board, or maybe just a 1”x4” board. With a total of 12 added supports, the stand was much more sturdy and I felt completely comfortable with it holding my 220.