A couple of quick points:
- You mentioned GUE software, so I am guessing it is Decoplanner which uses Gradient Factor algorithm. You didn't mention which GF hi-lo used to generate your deco profile. The deep stops are usually 1-min duration, and spaced out every 3m.
- Your VR-3 uses Buhlmann algorithm with "micro-bubble" feature (i.e. similar to Pyle stop). The deep stops are usually around 2-min duration, and spaced out similarly to Pyle stop.
- Therefore the profiles won't have the same shape.
Also,
- There is usually no 20-m stop in GF profile.
- For a straight squarish profile, tables could be less conservative than computer depending on the settings of both.
- VR-3 profiles are generally more conservative even with ZERO conservative setting.
- If you "missed" a stop per the computer instruction, the VR-3 should still compute the deco profile using "best guess" while telling you to "use table" for reference.
As with all tools, they work well if you know how to use them properly.