You're locked out. The lime you added to the soil is 'used up' in terms of its buffering capacity to balance out the acidity from the peat moss, and you will need to flush the plant and confirm that the pH of your medium is indeed below 6.5. Peat has a pH that ranges from about 4.5 to 5.5 naturally and can cause problems when the plant has been sitting in the same pot for too long.
The magnesium shortage is visible in the regular striping pattern on the leaves, and is caused by the roots' inability to uptake micronutrients at extremely low pH.