Desired results have painstakingly been achieved as follows, with explanations in parentheses:
1. Ensure that the width of every field in the form is a numeric pixel width and not a percentage (reason: percentage widths will not format properly when emailed)
2. Each line of the form has to be created as a separate table (reason: when the browser form is submitted via email, it does not like merged cells and will completely mess up the formatting)
3. Any date-picker contained in the form has to be recreated separately in its own section as just the data for the email submission, using the guidelines from earlier in this conversation post (regarding section hiding and such). This will thereby make sure that the date-picker field itself will not be part of the email submission (since the date picker field will also completely mess up the formatting)
To elaborate, in one instance I have one field that is a date picker, called "Date"; this field with title are now in their own section, which I have called "DatePicker_Section".
I have created a second section directly beneath this, containing a text field called "DateValue", in a section called "DateValue_Section". The "DateValue" field is set as a locked Date formatted text field (and not a date picker field), with the formula set to equal the value of the "Date" field.
I then used the sections and rules outlined earlier in this handy post from Hilary Stoupa, setting it up so that the DatePicker_Section is visible when the form is being filled out, but that the DateValue_Section is visible when the form is submitted via email.
Following the many painstaking hours it took to make all these changes, my form is now properly submitting and emailing without messing up any of the formatting. :)
:D
Thank you all for your help!