-50 FPS in Fortnite After Upgrading GPU to 5070ti

I replaced my 2070 Super with a 5070ti, used DDU to install latest driver and (un/re)installed my game. Upgrading my gpu has gave me less fps. I used to average 150fps, now I'm at 100fps.

I was getting an unstable 200fps for the first 1hr, then I dropped to 50fps followed by my pc freezing 30m later. After, I'd get freezes within 10m until I made changes in bios (pcie gen & spread spectrum). I then Undervolted GPU & OC'd my CPU to 5.0Ghz in hopes of higher fps, but it hasn't made a noticeable impact. Here's an overview of afterburner

Afterbuner: [GPU] 50C w/ 22% avg usage [CPU] 70C w/ 72% avg usage [Power Percent] 22%
Game Settings: Performance Mode, everything low/off, except high view distance. Nothing has been changed.
Specs: [PSU] 800w [MOBO] PRIME Z390-P [GPU] Gigabyte RTX 5070ti [CPU] i7-9700k [RAM] 32GB DDR4 (4x sticks) [SSD/ C-Drive] 1TB T-FORCE CARDEA ZERO Z440 M.2 2280 PCIe Gen 4.0 x4 (500GB unused space)
Configuration: [XMP] Enabled, [PCIe Gen] set to highest (3.0), [Blck Spread Spectrum] Enabled, [Resize Bar] Enabled