Yeah, that's quite common for ADA Aqua Soil substrates, the pH will be very low initially and the ammonia will be very high, most people plant heavily from the start to take advantage of all the released nutrients.
Just do large water changes daily (which is part of the recommended steps by ADA), add mature media from your existing tank, and it'll be cycled quite fast.
For new tanks with mature media added, i usually do 100% water change daily for the first 3 days, then 75% daily for next 2 days, then 50% daily for the next 2 days... it usually cycles fully within a week and the pH should stabilize nicely at around 6.4-6.6.
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