You could try to fool with swapping write strategies, but there are no guaranteed results and most likely you will have bad results unless you do the research and choose wisely. This guy got good results with swapping the TY02 strategy for the TTG02 strat, but with a 1653 burner. The TYG02 seems to be the strat-swap-of-choice for many 8x -R media. However, if you do end up buying some TY02, you might want to swap back.
Here is a good result with TTG02 and CG3E.
In OmniPatcher, for CG3E I would recommend "Apply recommended DVD...", and "Increase dvd..."' and " Enable auto-bitsetting", and "fix the 'dead...cross-flashing"(if that isn't greyed out).
A 'vertical' burn should not affect results...many external burners come with a vertical stand...but if you wanted to try a horizontal burn, it couldn't hurt. Overheating and dirty lens could all affect burns in a bad way.
Best recommendation...get better media and save the other discs for another burner and another day...maybe someday there will be a better burn strat for them...or trade them to a somebody who has a burner that likes those discs.