I have just received an othree drysuit, the ri-100 ccn drysuit. my drysuit boot is 8/9-8-42. these are the sizes printed on the bottom of the boot. for those of you familiar with this drysuit the boot is quite slim, not bulky at all. i have tried on both the large and x-large jet fins. both slipped in, the large requiring a little bit of work. this was done in dry conditions. opted to purchase the x-large however having doubts. how far in is the sole of the foot expected to slip in? when comparing the actualboot to the fin and how far it it could move in, it appears theres a bit more room in the front. its hard to determine how much room remains with the boot on and the fin on. any suggestions?