Next difficulty retarget occurs at block 391103.0 (eta 3.1 days): 1.2265138042e+11 / +31.3% [est.]
that's way off
for the 30% jump to happen you would need to solve the remaining 600 blocks all at once
10-15% is likely though
This is going based off of this Bitcoin ROI calculator. They are predicting the jump will occur within 3.1 days. I have 3 Batch 9 S7 on order and was getting ready to pull the trigger for another Batch 9 once my Power is upgraded until I saw this. Where are you getting the 10-15% number from?
https://alloscomp.com/bitcoin/calculator
That is not a good source- here is a more realistic link:
https://bitcoinwisdom.com/bitcoin/difficulty