I have been working out moderately for 1 years now, and the last year I have been training to develop more strength (~85-90 max weight, 5-3 reps range) but seem to hit a plateau where I experience soreness after every single workout which is fine but after 2 weeks or so of continuous training the soreness becomes excessive and it takes away from my enthusiasm and energy so I have so stop and rest a week so the soreness goes away and I can train again.
I still get results but it seems to be at a very slowly rate(it takes about 6 weeks to be able to add 5 more lbs). So my question is this a good sign saying yes my workout is being effective or is it a sign that I might be putting too much strain? Or is it cause more of nutrition and/or rest? Or is this what I should expect from this kind of training?