Probably low salt level. Since you are starting out with a relatively high 180 ppm for TA, did you have to add any baking soda to raise it or did you have to add any calcium chloride to get to 240 ppm for Calcium Hardness (CH)? If not, then your salt level is probably very low and this can put pressure on your eyes (which are around 9000 ppm salt). Your previous pool water probably had more salt as the pool water was older and over time the chlorine addition and usage would build up salt.

If this is the case, then you can add extra salt to your pool or you can just wait and over (a long) time it will improve as you add and use more chlorine.

Richard