With those compression numbers, I suspect you are due for a rebuild. I highly recommend replacing the exhaust valves with stainless steel ones so they will not burn in the future.
The Metro will run with compression numbers as low as 90 or even less, but will not run well. Here are some threads that may help you do the entire rebuild yourself saving you lots of money..............
1.0L Head Repair Guide
Bottom End Rebuild Guide
Mrs. Mullet's Extreme Metro Makeover
The Weekend Rebuild
Good luck!