Don't use any magic-elixirs in bottle. They'll often cause more damage than cure.
Other possible cause of low-compression is burnt exhaust-valves and/or seats. A leak-down tester will give you confirmation if leak is going past rings or valves. Then you'd have better idea of which areas to inspect.
A lot of times, ring-leaks are caused by carbon from too-rich mixtures or burnt-oil clogging rings. One hail-mary operation before tearing engine apart is to do piston-soak to dissolve some of sludge which may be clogging rings and preventing seal. Do both cylinders:
1. spray in PB-blaster for 5-sec down spark-plug hole
2. crank engine 1-sec to spread it around
3. follow with 3-4cc of acetone
4. lightly lay spark-spark over hole to prevent evaporation
5. let sit for 3-4 hrs
6. follow with 3-4cc of 50/50 acetone/ATF mix
7. let sit for overnight (6-8hrs)
8. follow with another PB-blaster/acetone mix
9. let sit for 3-4 hrs
10. crank engine to blow out any residual mixtures
11. re-install plugs
12. warm-up engine and re-do compression test.
Depending upon how much improvement you get, it will be additional data for diagnosis.
