I've got short nail beds (so I was told by one manicurist) and very weak nails Emma.
I have no luck with the DIY false nails but the salon done ones have always been fine.
One tip I would give you is this...
If there are any Chinese salons offering false nails near you, get them done there.
You might pay slightly more than in other places, but in my experience, they are well worth
the money.
The best nails I have ever had done were done by a Chinese lady, and talking to other
women on holiday, it would appear that their best nails were also done by Chinese people.
(Not just a couple of women - a lot! And remember, these women were from all over the UK.)
There was a slight difference in how the Chinese lady did the nails to other salons, not much,
but enough to give them absolutely brilliant staying power.
(They were the only nails that have not started to drop off off after 3 - 4wks.
I had to have them removed in the end.)
When you find a salon you're happy with, mention that you have a problem with your nails and that
they don't usually last longer than 3 days. I'm sure they'll be able to help you.
Good luck.