How many of those 1,000 hours are continuous endurance training versus strength training? If the bulk of it is continuous endurance training, then you’re well set up to perform aerobically.
If aerobic pursuits are your priority, then dropping weight will be the lowest hanging fruit. Somatotype limitations aside, if you could drop 30 pounds, that would put you at the high side of an endurance height/weight ratio; drop 40 pounds to mid-range; drop 50 pounds to low-range and probably ideal. Of course, you can only go as low as you can stay healthy.
The gratification of relative performance grunt work will quickly be reversed in a fast and light context, so again, if aerobic mountain pursuits are your priority, then it sounds like you could avoid all strength training altogether and atrophy some muscle for the most obvious gains.