It is doubtful that your LNBF is anywhere near a 0.3dB NR. The NR of an LNBF has much less effect on the reception of standard DVBS QPSK signals than the dish size. A LNBF can not make-up for lack of signal that is not captured or reflected. Dish size and surface accuracy are much more important factors.
LNBF specs are often embellished to decrease the noise ratio and increase the gain, but there are many other variables in an LNBF performance that are never hyped in marketing. Bottom line is that quality built .8 usually outperforms .1, .2, .3, .4dB NR labeled LNBFs. Wait until more signals go to 8/16psk. Then we will see how well these LNBFs perform!