Shimming the spring will only help if it is relieving pressure too soon. At this point you really don't want to be guessing at such things. The shop manual will tell what the pump pressure should be. They typically run around 1200PSI.
Sometimes you can hear the relief valve when it's open, the sound it makes when the steering is turned hard against the stop and the pump begins to howl. If it's making the howling sound before the steering is against the stop, increasing the pressure might help, again best to test, not guess.
If the pump never goes into relief, that is a sign either the pump is weak, the cylinder seal is bypassing, or the directional valve is not sending full fluid the direction it needs to go.
Other factors could be binding in the steering, dry bushings, metal to metal bushings, bent components, or if there is a front loader it will make for very high demands on the steering.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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