Yep, me too. During loading weeks BP hovers around 105/65, at the end of rest week 115/75. No blackouts but during Sweetspot Base HV felt light-headed when standing up. Interestingly, haven’t felt it with Traditional Base HV although BP fluctuation has same pattern depending on week.
IIRC, Amber did deep-dive on light-headedness topic in one of TR podcasts.
EDIT: Why Cycling Training Can Make You Lightheaded (Ask a Cycling Coach 267) - YouTube