WTT...8/9 wt. CND Gravity Point spey line for a 7/8

Recently purchased an 8/9 wt. CND Gravity Point spey line (70' head) but after trying it on the lake for it's first time on water realized I should have gone with a 7/8 because it would have been more suitable for my 8 wt. rod. It would be the perfect line for a 9 wt. Bought it from a fellow who had never fished it either so for obvious reasons it can't be switched out at a store. If you have a 7/8 that's in good condition and want to swap lines let me know. Surrey, BC Cheers~