Unable to modify the X-axis and LINKAXES setting when using YYAXIS

Dear all, the objective was to plot a double YYaxis for a two different signal. In addition, the X-axis will have two different Xlabel at the bottom and top as shown in Figure 1

Figure 1

To achieve this objective, the code as shown below were used to get the following graph as shown in Figure 2.

Figure 2

However, there are some problem with the outputted graph as highlighted by red circle in the figure 2. The problem are

1. String overlap at both left and right YY-Axis.
2. The X-axis (time) of the two signal does not align perfectly.
3. The tick at top-X_axis (for the string X-axis label) mirrored onto bottom-X_Axis and vice versa for the tick at the bottom (numeric label @ time in hour) reflected at the top X-axis.

In addition, whenever the LINKAXES was enable,the amplitude scaling between the two signal was distorted a shown in the Figure 3.

Figure 3

I really appreciate if someone can point what I have been overlooked. To help the discussion, I attached together the mentioned code and mat file together with this thread.

Thanks in advance!

load('st_data.mat');
yyaxis right
errorbar(st_X_hour, st_Vec_Y1_mean, st_Vec_Y1_Sd, '--x','MarkerSize',15)
ax1=gca;
set(ax1, 'Xtick', st_Xaxis_intrmit, 'XTickLabel',st_XLabel,'XAxisLocation','top'); xtickangle(90)
hold on
ax1_pos = ax1.Position; ax2=axes('Position', ax1_pos,'XAxisLocation','bottom','Color','none');
yyaxis left; 
plot(st_X_hour,st_Y2,'Parent',ax2)
hold on
scatter(st_Xaxis_intrmit,st_Vec_Y2)
%%Please enable this to get the problem as in Figure 3
% linkaxes([ax1 ax2], 'xy')