Yes even an 1/8" can make a big difference on your speed, comfort/discomfort. If you decide to get a professional fit. mark the seat post next to the seat post clamp. So if it does come loose next time, you'll know where to set it. Carbon seat post is black so I use a red Sharpie permanent marker. Even then, its barely visible. People will not notice.
(I also draw a down arrow to the line I've drawn around so its easy to spot).


Nose up/down can make your ride really uncomfortable. So do play with the angle of the seat. I like mine pointed down a tad.

And seat forward/backward makes difference too. Again play around with the position.

BTW, were you riding PV drive West around 5:30pm ish on Thursday?? heading south bound and about 3/4 mile south of Malga Cove. I saw a person looking like your avatar.

And RR welcome back it's been a while. no??

smilingcat