Extra weight on a scrape blade

[deepNdirt]

Did you try adjusting the toplink?

I wasn't going to chime in on this one being I never have used a " scrape blade " But I would say unless the scrape the OP is using is a el-cheap-o scrape, he should be able to achieve better ground engagement through adjusting the top link in order to get the correct pitch to the blade,
even though I personally have not used a scrape-blade (not really had any call for one), Though many years ago when tractors were used in landscaping business I watched them around the new homes when prepping the finish grade, I've seen where they swing the blade 180* in order to float/drag the top soil, I don't think I recall seeing anyone actually use a scrape blade to do any serious digging, But I guess with enough weight it would dig,
My neighbor had a tractor with a scrape blade, about once each year he would scrape his 500 ft driveway, I think it was just to fill in the pot-holes and drag the gravel from the edge back into the driveway where it is most needed, I drag our driveway with my FEL pulling backward, It seems to me that the blade being backward works pretty well, instead of having the blade dig in, Just my:2cents:

 

[Dr_Zinj]

Be very careful about adding weight to your back blade/scraper as you can bend your A-frame supports to the top link, making it impossible to raise or lower your blade.
Better to lengthen the top link to increase the angle the blade digs in at; or angle the blade to get more of a cutting action instead of just a scraping one.