Hi Cheryl,
Normally, if you have a number that is much lower than usual you can do one of 3 things: 1) stall and test every 20-30 minutes until you get a rising number. DO NOT FEED when stalling (food will raise bgs artificially). When you get 2 rising numbers in a row, it is OK to shoot. Remember to move your next shot so that it will be 12 hours from the time you shot.
2) Shoot a reduced dose (for example: half of your normal dose)
3) Skip the shot and resume at your normal shot time the next cycle.
Since you have already fed Joplin, option #1 is not a good choice.
Be sure to read the "Sticky" on how to deal with shooting low numbers. Print it out so that it will be available if no one is here to advise you.
Looking at your spreadsheet I see that you seem to be jumping around in dose. Generally speaking, for Lantus to work the way it is supposed to work, the dose should be consistent, only changing according to the TR protocol. If you are making too many dose adjustments too close together it will be difficult to regulate Joplin.
I hope that one of the very knowledgeable people on the board will be along soon to guide you in your decision. I think that I would skip tonight's shot if I were in your situation.
Welcome to LL (this is my first visit to your condo),
Ella & Rusty