In terms of the geometry of the parcel and its closure, it isn't the worst I've ever seen. The direction of "westerly" can be any bearing between N 67º30' W and S 67º30 W. When I build the parcel based upon the info you've provided (I "backed in" the closing bearing and distance) and force close the third call, I get S 84º56'50" W 183.44'. A 2.5 foot closure error on a parcel created before the time of EDM's and sub 10" guns isn't bad. (Circa 1960)
I wouldn't sweat the acreage. The layperson tends to place too much emphasis on acreage, while we surveyors know that acreage is a calculated value. An acreage can never be directly measured; it can only ever be derived from measurements. It is therefore subject not only to the systematic and random errors of observed measurements, but also to any human error in performing the calculation. In my opinion this is the core reason why acreage is so low on the list of priority of calls.
You've stated that you have a point of commencement? I'm unclear about this, but it seems to me that if you do have a reference to a monument (old intersection) that places the location of the POB a certain distance down the road, then you have a pretty good place to start. The center of the road is also a monument, one you can and should hold to all day long.
The problem seems to be on the interior lot corners - by what you have written no physical or record mons were called for. This will probably give you the most heartburn, especially if you find mons for the corners that fit the lot measurements but don't land at the record position for the parcel. I know you already wrote that you found very few mons, but you never know.
You said the greatest problem is on the south; what exactly is the nature of the problem? Are you referring to the error found in the third call, or something like an angry neighbor to the south?
In my opinion. you need to start at the start - which lots came out first from the parent parcel? Build them first based on senior rights and work forward from there. If by chance this parcel was the first one out, then your job may actually be relatively easy:
Establish the POB using the reference to the old intersection.
Hold the 100' alignment of the center of the road and draw the first 2 calls.
Force close the 3rd call onto the sw'ly corner.
Close the parcel back to the POB using the 100' call.
Senior rights here dictate that the first parcel out "gets" its due. Its due along the third call is open to interpretation. Coming from a colonial state, I tend to hold direction over distance when applying the rules of construction. For this reason I would not "give" the parcel the186 feet called for, I would force close that line at 183.44 feet. While this process is tantamount to the reviled "deed staking", it is the correct approach IF the parcel is senior.
Sorry if this has been a lecture. Hope this helps, and keep us posted.