Love how quick your easy pace is now. Sub 2 half for an easy run is impressive. Definitely just try and ensure the RPE does stay down at 3-4. If we start edging towards 5-6 we actually get less benefits. It’s at a low intensity that our body produces more mitochondria which are key. The minute we go above that easy level the signals change and we don’t get the same benefit. Hence why we always want to keep the easy runs easy. Just something to bear in my and good to have that awareness and knowledge. HR can be a good indicator too, but our watches are not always accurate. Anything over 145 HR for me is getting too high. On my run I averaged 137 today, you averaged 153 (assuming the data is accurate). So it might actually have benefited you more towards the end of that run, when the HR was creeping over 160, just to ease back on the pace a little. Any questions just ask. Hope it makes sense.