I would caution about alterating the spring pressure from the proper microswitch, the switch and metal strip size are to ensure a minimal amount of air flow is going through the combustion chamber to purge vapours before ignition and insure proper combustion. It is possible to alter it to much and cause potentialy dangerous issues.
there is also the issue that to many people change the sail switch for no reason the with in days they are having the same issues. sail switches are rarley the issue, but seam to be the first thing people recomend to change in my opinion.