Yes 99.5 and slightly longer by hours or days? No pips yet. No bad smell either.
Are these the ONLY thing you have in lockdown? If so you will be OK, let them do there thing, They should be cracking real soon, as long as they are still moving your OK. try to give them there due date although I usually have ONE that wants to come out early on day 25. 99.5 is a very good temp. I would try to keep the humidity at 65.
No they can not get sticky in lockdown, the only thing that could happen is if the Humidity gets to high like 80-85 it will kill them, WAY to high for them.
They have to lose so much water during day one threw 23 if they don't this causes them to get sticky, usually stickiness is cause because you are trying to hatch multiple at different due days and raising the humidity up for those that go into lockdown in the same incubator.
so you really want to avoid that and the best way is to either hatch all at the same time or have a second incubator ready for lockdown. The only time you can cause shrink wrap is if they are cracked or you have the safe hole and you keep opening up the bator, when temp goes down there membrane shrivers up. So if they have not cracked or there's no safe hole, you can't shrink wrap them. So you are OK, I would just sit and wait, if there due date comes and there's nothing still, get a hold of me and will see what the heck's going on.
There's NO need to ever have to help a duck or a chicken totally out. You have to let them do it on there own, if you do not, you can cause them to die early. helping them get there heads ouut is as far of help that you want to go....They need to accomplish using there legs to get the shell off so they build up some strength in there little legs.. Remember they are confined in a shell will NO muscle control.. so as little help from you as possible so getting heads out is safe but that is as far as you need to go.
Right now you don't need to worry about any of that, let them run there course, give them there due dates..