OK, you've really got two related, but separate issues here, so let's talk about the separately.
OK I'll start.
My LDs are random events and usually short-duration.
Could it be that I will never have an induced LD? Any top tips?
First off, everyone is an individual and different. Some are natural LD'ers, some are not. Myself, I am a poster child for lucid dreaming. Unless I really work at it, I just don't have many, perhaps you are like me.
I'm sorry I don't know this, but how long have you been working at it? Also, I'd like to ask a couple of questions.
1) What time of the night do you have LD's?
2) What is your sleeping environment like?
3) What time do you go to bed and how much sleep do you get?
I don't know, how long have you been working on LD?
I have never been able to WILD, MILD, DILD or anything like that. Not a single induced lucid. Ever.
The more I try, the worse my recall gets so I'm reluctant to try hard at all (and won't for a short while).
This is a new one on me, I've never heard of induction methods causing problems with recall. Usually, the opposite is true. I have a hunch though that what you are doing or your mental state or anziety level is causing the problem. Let's try an exercise.
For the next days, while doing your induction techniques, try to keep detailed notes. Keep up with the technique you are trying, your mental state, anxiety level and so on. Also at night, log what time you try the technique, the time you go to bed, and any times you get up during the night. You can keep all of this in your bedside or bathroom dream journal if you wish.
I hope with a little more information, we can find some clues.