I suggest you should just stick with special attacks because blissey's SPC ATK is not bad at all.
yeah thats what i was thinkn
maybe get rid of charm and replace it with giga impact.
No offence but the only pokemon you should consider using Giga Impact (or any two turn move really) with is Slaking (since Headbutt does the same amount of damage per turn).
Also Blissey would do more damage with Seismic-Toss than Giga-Impact due to low attack and ST set damage.
CftC: 100 HP is good considering Blissey is a sponge (Sp.Wall).
whatever. i still say its better than charm