Superposition problem with \$\Delta\$-Y conversion
I'm going to assume you were able to handle the currents correctly in all of your circuits except for the last one. I think you laid them out correctly and I'm fairly confident in your ability to work out the magnitude and direction, in those cases.

So here is the final circuit case where I think you messed up by mushing up \$R_5\$ into your \$\Delta\$-Y conversion. You need to do that conversion differently, as shown here:







simulate this circuit &ndash; Schematic created using CircuitLab

Note that I didn't destroy \$R_5\$ with a \$\Delta\$-Y conversion. I chose, instead, to convert the other \$\Delta\$ so that \$R_5\$ was left intact.

At this point we don't care at all about \$R_A\$. All the current flows through it. We only care about how it splits, after that. Here, you can see that the two branches are \$1.25\:\Omega\$ and \$1.5\:\Omega\$. This means a \$5:6\$ ratio. In other words, \$\frac{5}{11}\$ths of the current is going to flow through the branch containing \$R_5\$. So the current in \$R_5\$ here is \$\frac{5}{11}\cdot 10\:\textrm{A}=4.\overline{54}\:\textrm{A}\$.