I would start by putting the return back to the first amended version. Then follow the instructions carefully so that TurboTax knows the original amendment and the changed figures.
Next take your original amended 1040 and compare it line-by-line to the new amended 1040 return to verify the change in the cost basis of your ESPP sale. This will first be seen on Schedule D and the tax on the gain difference is likely 15% if it was held long term.
The tax on the additional cost basis should be your refund amount using the capital gains tax rate, again assuming long term holding period. Otherwise it would be your regular tax rate times the additional cost basis originally omitted.
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