I'm going to ask a stupid question and plse don't take this as an intelligence insult but did you correct all the mistakes on the board as outlined (The jumper, resistor and trace cut)? I myself have forgot to correct board errors outlined in the bdoc.
The meaning for the chip letters are on their data sheets. The ones you used are what I would have used for the build. Most of the time the letters indicate packaging info. But when in doubt check the data sheet.
As far as the cap I don't think it would cause that huge of a drop but someone else who is smarter than me can answer that.
If you corrected all the board mistakes go back over and reflow all your solder points and look for bridges between pads. Make sure your off board wiring is correct and there are no stray wires touching. Posting a picture (front/back) can also help when it comes to troubleshooting. Some of the guys on here can spot problems quickly.
The meaning for the chip letters are on their data sheets. The ones you used are what I would have used for the build. Most of the time the letters indicate packaging info. But when in doubt check the data sheet.
As far as the cap I don't think it would cause that huge of a drop but someone else who is smarter than me can answer that.
If you corrected all the board mistakes go back over and reflow all your solder points and look for bridges between pads. Make sure your off board wiring is correct and there are no stray wires touching. Posting a picture (front/back) can also help when it comes to troubleshooting. Some of the guys on here can spot problems quickly.