Hello, many have tried this, and it appears for 100% rimfire ignition, the 17# spring is as low as most can go without other mods as well.
For me ( I have 3 kits) even going to a 16#MS will cause some FTF, especially if the chamber starts getting dirty. 17# keeps it running.
To drop below 17#, you may need a weaker FP spring, but then the rear plate ( FP retainer) can become an issue, or you can try to reshape the firing pin itself.
For me, the 17# was the safest compromise.
Good luck
Rich