you have many questions in many different threads spread out in several forums. seems most of your questions have received a response even if you do not fully understand the answer.
your disc quality scans posted in the pioneer 215 thread appear to be okay. however disc quality scans are not an indication of disc playback. disc quality scans will give you information on the quality of burns you are receiving [as ive stated in response to your questions from the same thread]. your best to use disc quality to find your favorite firmware, write speed, media id, burning software.... etc... then use the transfer rate test and scan disc read test to find how well your disc is read.
your quality test should be performed in the samsung drive and the TRT and read test performed in both your pioneer and samsung drives. dvd drives read disc differently even when comparing the same models. and even this will not ensure you will not have playback issues as dvd players read disc differently than dvd writers.
it is most important to properly handle and store your disc to ensure your disc are not skipping during playback.
i read in one of you threads you had a question about ripping speed. the speed you are performing the rip will not directly effect the readabiltiy of a burned disc containing a video. however if during the ripping process there are reading errors then the resulting video may have the errors present during playback. if your ripping software has settings to adjust skipping of bad sectors and retry times, keeping these numbers low could mean a disc might not rip because of read errors. but if you set these numbers high then if there is reading problems the video may present playback problems.
the playback of a bad rip has nothing to do with how well a disc is burned. the errors are present in the rip itself and not during the burn process.
even using TRT to test disc is not a 100% indication of anything. there are many threads available here which you need to read. just take the time to read the information.
here is one example of a disc ive burned in my pioneer 115d 1.18, ive watched the disc twice in my standalone dvd player and there are no problems during playback.