On 1050Ti my rule is , keep Core under 1950MHz. Above that you risk BSOD, Crashes and etc.
Upping voltage and Power limit wont damage your card in any way, since its pratically hard locked in bios.
Memory chips, with samsung memory you can achieve sometimes stable +1000 in some games, but most of them wont like them, soo keep memory to +300-500MHz above that you risk crashes , some weird textures and etc.
On other memory keep it +300MHz.
On overclocking 1050Ti from my experience I got 1-10Fps, but nothing more, cause I had then i3-4170, now I have xeon.