I'll tell you my preference/opinion.
I don't know the design of the rifle you are scoping,or the scope. Sometimes rifle or scope design makes it difficult to achieve the ideal.
When you lean or twist your head to an unnatural position,you tilt your inner ears.Thats your balance mechanism.You will shoot better standing with your head in a natural,erect position.
If you have to hunt around with your eyeball to find the scope field of view,its slow ,awkward,and you will not shoot so well.
While on some military rifles,the point of stock design seems to be a handle for a bayonet, ideally,the stock design should be an ergonomic interface between the barreled action,the shooter's line of sight,and the shooter's body(shouder,mostly)
Whether scope or iron sights,when you mount the rifle in shooting position with your eyes closed,when you open your eyes,you should have your iron sight picture or full scope field looking through the reticle.
Lower rings,if possible,are a start. This is part of my objection to objective lenses much over 40 mm.A 56 mm astronomical telescope on a hunting rifle will require high rings. Unless the stock is designed for the high line of sight,the shooter is handicapping himself/herself.
How do you get there? I've milled the top of the comb flat ,glued on a block of wood,shaped it,and painted the stock black.
You can get (or make) adjustable comb hardware.That CAN be as simple as drilling two vertical screw holes at the top of the comb,then carefully slicing the comb off with a thin kerf saw. Try shims till you get your height.Shape to blend together,and screw it on.Look at adjustable comb kits or rifles to get an idea of how to cut.
Another way,typical for AR adjustable combs,would be to protect the stock with plastic film and lay up a wrap-over false comb over the top of what you have(fiberglass).You could form Kydex in similar fashion. Carry it down the sides of the stock. Horizontal clamping screws and slots will give you adjustments.
Come up with a low mounted scope system
Maybe a thick leather (saddle skirting) patch "Monte Carlo" style would be enough.
You could cake on very thick makeup,I suppose...But imo,the rifle/sights have to fit the shooter.Or its a serious compromise.
I have purchased two Gru-Bee Wolf Pup scopes for my Grandchildren.I may buy another for myself. They are a copy of the 1970's "Baby Redfield" 22 scope. I'm favorably impressed with them. About $140 USD. with rings/tipoff mounts(3/8 grooved receiver) Gru-Bee has a website.
Spring air guns have an impulse that may be destructive to scopes not designed for it.
