Fox,
Don't mind them.
There is nothing wrong with asking a question. Better to ask it now, and think about it now, then when your engine quits.
Anyone who thinks that they will do everything perfect in a PFL is a fool. Someone once said to me, that on every flight you make, you will make at least one mistake. The danger does not come from the mistake itself, but in developing an attitude where you no longer recognise the mistakes.
If you can make mistakes on flights where everything goes well, then I'm sure you can make mistakes too when the engine quits and your under extreme pressure!
Sure you should see the wires before you get there. But what about the case where you pick a field, set up for it, then notice some fence running through it, and are forced to change your field? You don't zoom back to 2000ft, and start all over again! You'll do the best you can with the time you have, and that may mean you'll miss seeing the wires until late.
So don't mind anyone who criticise you for asking a question. Knowledge comes from asking a question.
Now to the question.
I would say, that it's not such a good thing carrying in extra speed, just for eventualities. Carry in the amount of speed you were thought.
Then if you are faced with wires in the wrong position when it's too late to change field (or direction across the field), there are only 3 possibilities.
1. Go over them.
2. Go through them.
3. Go under them.
1. is only an option if you have A) sufficient speed & B) sufficient field the far side of the wires.
2. Never really an option.
3. this would be my choice. I would be inclined to force it down, even though this may mean extra damage to the aircraft such as nose wheel collapse. At least your 'crash' will happen from 1 ft above the ground, instead of 30ft. While you probably will hit the wire, it should at least only be the tail that hits it, and not the cabin.
At the end of the day, it's about minimising the risk. Stalling from 30 feet is never going to be a good thing, and neither is hitting the wires while flying....particularly if they hit the cabin.
As for carrying extra speed, just in case you see wires at the last minutes, I would suggest the extra speed it likely to cause you more problems, than the possibility of having missed the wires in your inspection.
dp