Thank you for the question. I have a very relaxed approach to training and running half and even full marathons. I listen to the body and I do not chase any particular pace or finishing time. For me, these events are great social experiences. I train for events. I make sure that I cover enough distance runs to make sure not to suffer, but the pace is really not important for me. I believe you are training for a much better finishing time than are mine (my best fo half was 1:50 and for full 3:59). So other runners will have better advice for your meticulous approach than me. You put a lot of effort in the preparation and this for sure is the most important... good luck with the rest of training and with the marathon as well!