It is common knowledge that the traditional system for counting High Card Points (HCP) is flawed. Ace=4, King-3, Queen=2 and Jack=1 overvalues jacks while undervaluing aces and kings.

More accurate is something like:
A=4 1/2
K=3 1/3
Q=2
J=3/4

I don't recommend using those fractions, but is is good to be aware of. All these fractions would give most people a headache.

I'd like to propose a simple solution.

When your hand is heavy with aces/kings (as opposed to having lots of jacks), just take a slightly optimistic view if you need to. For example, if you are thinking of going on, do so.  After 1-3, go to 4 with:

 A10876  
 A2  
 A432  
 54
 

but, pass with:

 QJ542  
 Q2  
 KJ32  
 KJ.
 

The 4-3-2-1 system also doesn't account for 10's and 9's.

Some teachers espouse counting 10's as 1/2 and 9's as 1/4. Again, I hesitate to make a player calculate fractions.

Regarding 10's, not all of them are useful. The 10 in each layout below is worthless:

10xx opposite Jxx
10x opposite Axx
10xxx opposite xx

In the following layouts, the 10 is potentially useful:

J10x  opposite Qxx
Q10x opposite Kxx
A10x opposite J9x.

Granted, I chose the examples carefully, but what do you notice? In the first group, the 10 is accompanied by only small cards. In the second batch, the 10 is accompanied by a higher honor.

In general, a 10 with a higher honor is quite valuable. Accordingly I propose the following guideline:

Add 1/2 point for a 10 if it is accompanied by a higher honor.

True, this is not an exact science. But, I recommend giving it a try to see if your bidding evaluation improves.