When has it Been too Long before you solo

As a society, we are obsessed with Numbers. We use them to compare
ourselves to others. I make X number of dollars, I have house of Y
square feet. My car, truck or other vehicle has an engine of W liter
(cubic inches for the metrically challenged).

As such, when someone asks "What is the average hours before
soloing?", they are trying to compare themselves to the 'average'
pilot. If they do it in less than the average, then it's 'look at me,
I'm great'. If they do it in the 'average' amount of time, then they
are doing OK. But, when their number of hours is greater than the
average, they may feel that something is wrong with them. "Am I
stupid?". "Am I slow?". "Should I quit now?".

I unfortunately find myself in the latter category... 47.7 hours and
no solo yet. Only two issues remain: simulated instrument flight and
landings.

With simulated instrument flight, I can do straight and level and
turns. But when combined with climbs and or descents, I don't meet the
PTS requirements. Either I blow the altitude or the heading. Take the
hood off and I can climb, turn, fiddle with the radio and look for
traffic (while chewing gum) without blowing headings or altitudes.

Landings. I fly out of LGB (Long Beach) and LGB is cursed with
WIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIDE runways. I say cursed, since
when we fly to CMP (Compton) or TOA (Torrance), I have no problem
staying on the runway center-line. But at LGB I can track the
center-line up to the flare, after the flare at touchdown I'm off the
centerline. Am I in the weeds? No. I'm usually 20-30 feet left or
right of the centerline.

Am I stupid? I don't think so. I studied Chemical Engineering and
Computer Science in college and I work as a Software Architect for
manufacturer of large transport category airplanes. Before someone
concludes that I'm a bookworm, I've renovated two houses mostly on my
own. When I say renovate, I mean gutting most of space down to the
framing and bringing the space back to code.

Am I slow? I read slowly, but otherwise see above.

I don't think it's the instructor. He is not someone who is teaching
just to build time and then move on to bigger airplanes. The only
comment I could make and I suspect that it would apply to many
instructors, is that he points too many things out. Yes, I know I blew
the altitude or the heading, pointing it out each time can get really
old, really fast. A suggestion for CFIs, sometimes it's better to wait
until the maneuver is completed before saying something. Of course, if
it's a safety of flight issue, then by all means say something.

At the school where I am learning, the instructor grades your
performance after each flight on a scale from 1 to 5. Where 1 is
deemed excellent and 5 is considered unsatisfactory. With 3 being
average. Reviewing my training records, I haven't scored greater than
a 3 since lesson number 13. From lesson 14 through lesson 33, I've
scored average to excellent.

Should I quit now? That is what I'm pondering. 47.7 hours and still no
solo.

Constructive suggestions or criticisms welcomed. Please refrain from
only saying 'don't give up'.