mashed with 4 g toped with 3 g total of 6 g in brew kettle with low reading added 200grams of dextrose boiled 60 ended with 1.060
Based on boiling 6.00 gallonsliters at 1.040 for 60 minutes, this will decrease your wort by 1.00 gallonsliters, bringing your after boil OG to 1.047. You wanted an OG of 1.061. It looks like it will be under.