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I heard the S41 has none of those problems. Did you swap the host on the S42?
I suggest an E2L https://www.aliexpress.com/store/product/JAXMAN-E2L-HOST-for-BLF-DIYers-without-driver-not-a-compeleted-flashlight-Only-Parts/1812094_32798763548.html It says it can't be delivered to the US for some reason http://www.mtnelectronics.com/index.php?route=product/product&product_id=831
You will bypass the need of a spacer like you need for a S2+ and be able to swap lens much easier.
The convoy M2 might be a good host too. https://www.fasttech.com/product/1277300-convoy-m2-diy-edc-led-flashlight-host