In reply to Somerset swede basher:
I am checking now! Thanks to Nick who pointed out there were a few late questions...
If you're not making improvements from following a 5x5 weighted protocol, I would suggest your problems are likely to lie elsewhere. I've seen a lot of climbers assume that there needs to be a tweak in the methodology, before checking in on a few VERY common factors! I've listed some classic ones below that happen year after year in the climbing population.
1. Are you eating enough? Operate in a calorie deficit (lots of climbers do this consciously and unconsciously) and you'll struggle to increase strength
2. Are your sessions high quality? Do them too late in the day, after climbing etc.
3. Are you recovering and de-loading your training frequently? Too many climbers forget about periods of rest to properly prepare for the next block of hard work for 3/4/5 weeks.
4. What's your life stress & sleep like? These both can massively affect training adaptations. Lack of response to strength training in people I've worked with who do 40+hrs a week, have lots of stress and also may be managing a complicated travel or family life struggle here.