Fully agreed. Eviolite Chansey is a better stall than Leftovers Blissey, due to the sheer defensive stats gained from the Eviolite.
I actually like running both Seismic Toss and one of Ice Beam or Fire Blast in order to avoid the Ghost inadequacy.
My typical moveset: Soft-boiled, Ice Beam/Fire Blast, Seismic Toss, Thunder Wave/Toxic.
I disagree with running any offensive move besides Seismic Toss on Chansey. Yes, it gets walled by Ghosts, but Chansey's Special Attack is so bad that its coverage options don't even 2HKO 4x weak targets:
0 SpA Chansey Ice Beam vs. 0 HP / 0 SpD Garchomp: 136-160 (38 - 44.8%) -- guaranteed 3HKO (meanwhile, Garchomp has an opportunity to set up Swords Dance and beat Chansey)
0 SpA Chansey Fire Blast vs. 248 HP / 200 SpD Mega Scizor: 120-144 (34.9 - 41.9%) -- guaranteed 3HK
0 SpA Chansey Ice Beam vs. 240 HP / 0 SpD Garchomp: 136-160 (32.6 - 38.3%) -- 95.2% chance to 3HKO