I used to plow with a JD 214 with very similar setup to yours - 42" plow, bucket of sand on the back, 4 link chains. I had the same problem you do, couldn't push much, used it more as a battering ram.
Now on my 2084 I have 74# wheel weights, 2 link chains, and I put steel in my utility box (nice job building that box by the way!). It's night and day different, I can push a 54" plow with no problem. I didn't fill the tires, didn't want to be bothered if I could avoid it, and I've found no need. I only have maybe 100# of steel in the box and could add more as needed.
Get some scrap steel to put in your box instead of the bucket, the weight will be low and you can double it. Then you either need the heavier wheel weights, or fill the tires, or both would be best. You'll be amazed at what it can push.
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