Editing Form Fields inside Acrobat? (after using LiveCycle Designer)

Question

Adobe Acrobat 9 Pro Extended ==  Acrobat
LiveCycle Designer ES 8.2 == LiveCycle Designer
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Say I downloaded a new PDF from the interwebs.
I want to add some forms fields so I go to Forms ==> Add or Edit Fields... (inside Acrobat)
Now Acrobat will detect possible places where to add the form fields. I make changes etc. Then I am  satisfied with my form fields.
Now say I want to remove a particular object from the PDF, lets take an image as an example.
So I fire up  LiveCycle Designer; File ==> New ==> Import a PDF document ==>  Create an Interactive Form with a Flowable Layout.
I remove that pesky little object.
In LiveCycle Designer, I save the file as PDF.
I open up Acrobat. I realize I need to make some more changes to some of the Form  Fields.
But now instead of "Add or Edit Fields..." option I get "Edit Form in  Designer..."
I hate the GUI of LiveCycle Designer --- I had rather edit the form  fields from inside Acrobat, as it is easy and fast to change multiple  form fields in a few clicks.

Answer 1

Thank you Niall for the above response; Your response gave me an idea which allowed me to remove that line by zooming in to 200%
You know Acrobat detects Form Fields for you.
But many times it makes mistakes, for example in the screenshot below it made the boxes that came with the PDF as text fields instead of check boxes.
The thing is rather than me delete the (form) fields it detected, and start over by making new check boxes, I will not be able to place my new check box in exact locations as Acrobat has done.
When I imported the fields that Acrobat made into LC (by saving the PDF in Acrobat and then opening it with LC) I get option to change the Object Type from Text Field to Check Box when I right click the object.
Is there a similar way to change the Object Type from Text Field to Check Box inside Acrobat? Any suggestions?
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I would really like to do it inside Acrobat because then if I have to make some minor changes to some field properties, all my hard work which I did by filling the fields gets deleted, as I am forced to use LC. The text I add to the fields don't get deleted when I edit the field properties inside Acrobat. I don't know why LC decides to delete all the text which is filled out in the form fields even though the PDF is saved in Acrobat before being imported into LC?
Here is the above PDF file with the text boxes:
http://www.mediafire.com/?lnn32jm5am5
Again thanks for all your guidance so far.