If you're gonna be building bows the best investment you can make is a spool of bowstring material.
I like BCY 8125, but I'd recommend any fast flight type string (anything made from spectra or dyneema). Dacron (B-50 or the newer B-55) will also work, but it stretches and makes it a pain to get recurve bows to first bracing during tillering.
As far as your bow goes, You need to get the middle third of the left limb bending more because it is currently bending too much near the handle.
The right limb is still very stiff. Keep removing material from the right limb until they are the same stiffness.
Make sure you escercise the limbs after making any tillering changes.
Do not draw the bow any farther than you already have until you do those things.
Leave the outer third of both limbs alone for now and report back after you do the above.
As another note, there are several reasons not to shape the handle until the limbs are tillered, at least while you're starting out. 1) the bow might not make it. 2) you can choose top and bottom later, this way you can choose the slightly weaker limb for top and less overall tillering may be required. 3. A flat block of wood tends to sit better in a tillering tree, unless you use a leather sling or something.
Lastly, a pistol grip handle with a sight window creates two weak spots you need to be careful of. 1) the sight window, especially where it is thinnest, and typically at the junction with the arrow shelf. 2) the waist of the grip.
In this case you really need to be careful of the remaining saw cut that's down in the crease of the sight window and shelf.
With a cut in it like that, that area will most likely be your weakest and most likely to crack.
I prefer leaving the corner between the sight window and the shelf rounded (filleted). I use a 1/4" round file to shape that area by working it into that corner, then carefully blend in the arrow shelf and the sight window using a flat file .... Carefully! Or you will get another sharp crease and start all over.
Hope that all makes sense.