To reduce vibration at low speeds, you need to use microstepping. Scrap the LM298 (it's a thoroughly obsolete device) and use a modern constant current driver instead, which is what your motors are designed for. Any of the low-cost drivers you will find on eBay that use the A4982 or A4988 can drive the 103-547-52500 motor. The 103H7123-0710 is designed for higher current - in fact a lot more than your LM298 is capable of handling - so something like this [www.pololu.com] would be preferable (it can drive the smaller motor as well).
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