Yeah, as far as I see you are making a BFC build (Combat reflexes, Standstill) but you are trying to use a scimitar for that. I understand you wanting to use the only real offensive feature from the class (Life on the Edge) but standstill without reach and maybe Thicket of Blades is useless.
Some ideas:
1) Drop standstill altogether. Focus on DD by taking power attack, Shock trooper, Imp. Critical (It's nice it stacks with your ability, and power attack criticals can be pretty interesting on a 12-20 range) and the like.
2) Focus on BFC. Take a crusader level for Thicket of Blades, get a reach weapon (a spinning blade, because you can't use a spiked chain), get some way of boosting your damage (Stormguard warrior and power attack) and then go for the OA feats.
In any case, drop monkey grip. Unless you really want to wield a large scimitar on a single hand, drop it. The damage increase is only from 1d6 to 1d8 anyway. And take Elusive Target far earlier. It's a great defensive feat, and you are taking it at level 18.