I am working with a combo of this effects: Fast Color Corrector, Three Way Color Corrector, Warp Stablizer, MB Cosmo and Neat plugin. Editing 1080p24 .MOV files from GH4 and GH3. WIN 8.1, PP 8.0.1, i7 3770K, 16G and a old GF250. After dozen tests... exporting, reinstalling, converting... I found a workaround to solve the flicker issue in Premiere.
When the playback is set to Mercury Playback Engine Software Only, the issues occurs randomly only with clips that have video effect.
So, I set back to the Mercury Playback Engine GPU Acceleration (CUDA) and the issue happens only in clips with Warp Stabilizer effect. In these clips, I replace for AE comps and stablize inside AE.
Hope this helps some one. Sorry for the english. Cheers from Brazil.