helpers/force-make: fix fast path to fallback

This fixes bug that caused force-make to go to fallback immediately after first batch of retries.

As a benefit it also adds some reporting of what is going on. This should help to locate fail point as well as to inform about execution progress.

One more round of fixing. @jschlehofer this causes again long build. This time it is because it goes directly to fallback (debug single thread build) instead of decrease.