How do keep multiple axes (with title) aligned during paper resizing?

I'm using MATLAB 2015a and trying to create a figure with two x-axes, two x-labels, and a title. It works quite well except I cannot have the title visible and the figure resizeable at the same time. Here is the code I'm using at the moment (Title is off-figure):

plot(phossimx,phossimy/(max(phossimy)-min(phossimy)),'Linewidth',1); %This is my data, scaled arbitrarily
xlabel('Field (T)');
xlim([2 5.5]);
ylim([-1 0.6]);
ylabel('d\chi"/dB');
gaxis=planck*(Exp.mwFreq*10^9)./(bmagn*phossimx); %This is used to calculate axis 2
ax1=gca;
ax1_pos=ax1.Position;
set(gca,'YTickLabel','');
ax2=axes('Position',ax1_pos,'XAxisLocation','top',...
    'XLim',[gaxis(end) gaxis(1)],'XDir','reverse',...
    'YTickLabel','','YAxisLocation','right',...
    'Color','none');
ax2.XLabel.String='\itg'; %top axis label
ax2.XLabel.FontSize=10; %top axis font size
ax2.YTick=ax1.YTick; %Match right axis with left axis
ax2.YLim=ax1.YLim;
ax2.Title.String='Co-P_i Sim at 130GHz'; %Title. if use ax1.Title.String, title is placed over ax2.XLabel

I've tried adding in ActivePositionProperty flags, and if I do

ax2.ActivePositionProperty='OuterPosition';
ax2.ActivePositionProperty='OuterPosition';

The second axis changes to the correct position, however the first remains in place, essentially misaligned axes. If I do a "hotfix" by adding in some arbitrary OuterPosition definition for ax1; i.e.

ax1.OuterPosition=[0 0 1 0.899];

It will draw the figure with matching axes, however upon rescaling it immediately becomes offset again.

Does anyone have an idea on how to make it so I can make this figure behave well with rescaling?