TPS61220: Requesting help with debugging unexpected behaviour

Tool/software:

Problem

I'm seeing unexpected voltage output and fluctuating current input on the TPS61220 that I've soldered on my custom PCB (details can be found below). I would kindly request help to debug what might be going wrong in my setup.

Context

I'm planning to incorporate a TPS61220 voltage boost converter in my project. To learn how to design the final PCB, I've designed a small PCB to test out just the boost converter. I've modeled the design to the TPS61220EVM-319 evaluation model. 

Notes

• I'm a hobbyist/enthusiast without any electrical engineering background, so could well be that I made some silly mistake, any help is appreciated .
• I don't have access to an Oscilloscope, but if there is something <$100 that would help with debugging, I'm okay with buying additional tooling.

Notes on the data below

• R1 and R2 are swapped around compared to the TPS61220 datasheet.
• I've used 180k instead of 178k resistor for R1 (in my datasheet)
• Therefore, I expect: VOUT = VFB × (R2 + R1)/R1  = 0.5 x (1000+180)/180 ~ 3.28V

Schematic and PCB

Figure 1: Schematic

Figure 2: Front Layers PCB

Figure 3: Back Layers PCB

Figure 4: Photo of assembled PCB

Measurements
Note: I don't have an Oscilloscope so the data collected below is from my Power Profile Kit II providing input voltage and current and a Multimeter measuring the output voltage.

Figure 5: 1v.png

Figure 6: 1.5v.png

Figure 7: 2v - with load.png

Figure 8: 2v - without load.png

Figure 9: 3v.png