Page Layout ⇒ Text jumps on 1st page to compared to 2nd page and after

[kjh4p]

I've been struggling with getting the margins correct. In the first page of the document the text plus footer is shifted up. I've looked on other topics (`header footer margins' and `why is my footer moving?') and I still can't grasp what is causing this. I'm using the geometry package with margin=1in (also showframe for reference). I've tried adding

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\setlength{\headheight}{15pt}

as was suggested in 'why..footer moving.' Still nothing. I'm using pdftexify from winedt6. Also I'm using fancyhdr package to make the header and footer. I have tried systematically getting rid of each package (and everything else too) and I've narrowed it down to the line

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\rhead{Header top line\\Header bottom line}

, but I'm not sure why it would act up this way. Below is the code I am using. Any direction or explanation that someone could give would be greatly appreciated.
Thanks in advance!

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\documentclass[pdftex,11pt,letterpaper]{article}
\usepackage[pdftex]{graphicx}
\DeclareGraphicsExtensions{.pdf,.png,.jpg,.mps}
 
%%For use in footer 
\usepackage{datetime}
\mmddyyyydate
\usepackage{lastpage}

%%Margins
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage[showframe, margin=1in, includehead=false, includefoot=false]{geometry}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%Header/Footer items
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{fancyhdr}                                                         %
\pagestyle{fancy}                                                             %
%                                                                             %
\renewcommand{\headrulewidth}{0.4pt} %%Header line at top of page             %
\renewcommand{\footrulewidth}{0.4pt} %%Footer line at bottom of page          %
%                                                                             %
\lhead{{\LARGE ACME Rocket Skates}}                                           %
\rhead{Header top line\\Header bottom line}                                   %
\lfoot{\today}                                                                %
\cfoot{Self destruct button}                                                  %
\rfoot{\thepage\ of \pageref{LastPage}}                                       %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{document}
page1
\pagebreak

page2
\pagebreak

page3
\pagebreak
\end{document}

[kjh4p]

Another question I can't figure out is why the top margin is not 1 in?

[kjh4p]

All right, Bob Knighten on Linkedin helped me with this one, but I thought I would post the solution here seeing as how I already started the tread. So the problem does lies in the size of \headheight as described earlier, but 15pt was still too small. I added

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\usepackage[showframe, headheight=26pt, margin=1in, includehead=false, includefoot=false]{geometry}

and it works like a charm.
Hope others find this useful too.