David, it sounds like the gain of your phono stage is right on the edge of what is required to run the Dynavector cartridge. While your phono stage might well have enough gain to get the job done, given the substantially higher output of the Shelter cartridge, I agree that this would be your safest bet. I think that the Dynavector cartridge is, overall, the better performer, but, if you don't have enough gain to run the cartridge, you would be left with no recourse but to upgrade your phono stage, sell the cartridge, or listen at less than fully satisfying volume levels.
By the way, I think the least of your worries is the tracking weight of the Dynavector cartridge. This certainly does not pose a risk to your vinyl. And if it provides you with any piece of mind, I should tell you that I have been running my Dynavector XV-1s at 2.0g VTF, and the sound is incredible. My advice to you is to disregard the VTF in making your decision. The question of whether your phono stage has sufficient gain is much more relevant.
By the way, I think the least of your worries is the tracking weight of the Dynavector cartridge. This certainly does not pose a risk to your vinyl. And if it provides you with any piece of mind, I should tell you that I have been running my Dynavector XV-1s at 2.0g VTF, and the sound is incredible. My advice to you is to disregard the VTF in making your decision. The question of whether your phono stage has sufficient gain is much more relevant.