Laminarman,
I reread some of your descriptions trying to get a picture of what you have.
It sounds like you have compacted soil, probably a fair number of rocks, and when you were plowing the plow would grab alot, or bounce? If so, it may have bounced completely out of the soil or went shallow.
Either that, or you didn't get good penetration deep enough into the soil and it didn't turn over well. It should be upside down. If it flops back into the furrow, you're not deep enough.
If any of the above, the chain drag probably won't do much good, and the discs will only work on the plowed "chunks" of soil.
Reasons I know for the above: hard soil, rocks (yeah, we've established those), and plows not digging deep enough due to 1) bad points or moleboards, 2) not putting 3ph down far enough, 3) toplink arm improperly adjusted and 4) draft setting problems. Many plows have adjustments on them, too, but in over 25 years, I've never changed them or know of anyone doing so.
For toplink arm adjustment settings, lift 3 point hitch aboout 2-3" off the ground, then adjust the toplink arm so that the base of the plows are LEVEL with the ground. Then I like to shorten it about a turn or two. (Yes, you may have to lower the 3ph to take the weight off to turn it /forums/images/graemlins/smirk.gif ) As told to me when I started years ago, the plows are made to dig and will, as long as you give them a bite.
Draft is often overlooked. If your draft isn't set properly, your plow will either constantly dig in and try to go too deep (have to keep lifting 3ph, then lower, then raise when digging in...) or fail to dig deep enough, leaving shallow furrows and unturned soil.
Draft allows your plow to adjust for resistance, allowing them to adjust for hard spots and digging angles. If too soft, the plow can go point down and dig in too much. If too strong, the point will constantly rise our of the soil or ride shallow. Someone else can probably offer more info about this, but what I know is if it ain't set right, it ain't gonna work right /forums/images/graemlins/wink.gif
If you aren't getting soil up the moleboard and digging approx 1/2 depth of base to top of moleboard, you are too shallow and won't turn the soil.
If any of these sound like what you are experiencing, try the suggestions and get a good furrow. You can adjust it in softer soil, should work about the same, or at least get you a good starting point. May have to play a little to get it right for harder soil, but it will get you started.
Gotta turn the soil, or till it.
It's pretty hard to replow, which is why I have made second passes at a different angle. Sometimes soil plows better in one direction than the other- try going another direction (opposite, or oblique angle)
Lastly, a ripper attachment may help for very hard soils. A subsoiler is similar with a little more lift than the simple tooth of a ripper.
If you can't turn your plowed soil with a shovel, chances are you have to replow or till, the discs won't do too much. /forums/images/graemlins/frown.gif
Can you post a picture of the soil so we can see the condition and how it has or hasn't been turned?
Sorry such a long post, but really want to see you get things back on track.
-JC