pulse the dose - take a break for one or two days. then go back to 100mg. thats a minimum, not a maximum.
up the dose - not as risky as it sounds, but higher doses do help the detox. also, the detox does subside, the more Iodine you get in you. again, take a little time or a long time - your choice.
utilization problems - you have the vit C for the uptake, what about the B vitamins? B2 and B3 help with utilization.
B12 shots - something new i have added. if you can get a big honkin B12 shot, do it. its going to take me an entire series of posts to explain it all, but it really helps.