The strain phenotype (wether it's a Sativa or and Indica) determines overall wether you get an energetic high or a couch lock high.
It's a common misunderstanding that amber trichomes produce a couch lock high, it's mainly because wrong information has been spread around and people keep perpetuating it, in the end everybody believes it's fact when in reality it isn't.
As already stated in the thread; amber trichomes contain degraded THC --> CBN.
CBN does not really produce a high, it does affect the high but not in a positive way.
CBN is pain relieving (as are most cannabinoids) but it does not reduce muscle tension/spasm.
Cannabinoids like CBD, CBG and CBC affect the high more than CBN does.
If you are looking for pain relief I would suggest you grow Indica strains and preferable ones with a decent % of CBD and CBC.
CBD is not only analgesic (pain relieving) it also reduces muscle spasm and it's a muscle relaxant (a very relevant cannabinoid for you).
CBC is also analgesic and it has a sedative effect as well.
THC however is also analgesic, therefore CBC should not be the end all of your search for a perfect strain.