Looking for a drive that is better at lightscribe labeling

I just converted all my families VHS tapes to DVD using two Samsung 18x SH-S182M and I had to print each label twice for decent results.

Yesterday I build a system with a 20x Liteon LH-20A1H and it was 95% as dark with just one printing.

(Both had the LS control panel set to higher contrast printing)

So has anyone done any detailed comparisons of the lightscribe performance of various models?