Size M or L in Mechanism?

Picture 1: L

Picture 2: M

Picture 3: M

Hey guys,

I’m currently deciding between size M and L in the Pas Normal Studios Mechanism Jersey and could use some advice.

For reference: I’m 183 cm and 79 kg, fairly lean but with relatively muscular arms.

Here’s my situation:

Size M fits very tight overall, especially around the arms. It’s not painful, but I can definitely feel some pressure / slight constriction.

Size L still fits snug and aero, but is noticeably more comfortable in the arms.

I own a Rapha Pro Team jersey in M, and that fits very similar to the PNS in L.

My main concern:I usually prefer a race fit, but I’m unsure if the tight sleeves on the PNS in M might become uncomfortable on longer rides.