I have a beard like yours. Use the straight at a shallower angle than the Feather. Stop using the feather as it is reinforcing the wrong angle. Try this, it worked for me:

Take the first pass with your straight, no matter how bad it is, with a shallower angle than you used with the feather. Use your non dominant hand to do the "non dominant" (same) side of your face. Concentrate on an effective pass on the flattest, easiest part of your face. For many this is the cheek near the sideburn. Finish your shave with a double edge razor.

Do that every day, checking to see how angle affects the shave. When you start getting decent first pass results on the easiest part of the face with your nondominant hand, transfer that angle to the dominant hand. As daily practice improves the result on the easy part of the face, start tackling the tougher parts.

Little by little, day in and day out, your results will appear.

Make sure you are not dulling the blade by touching it to anything but a strop, your face, a careful towel wipe, or a hone. If your straights were originally honed with a secondary bevel or with tape, you may not be getting them sharp even though your honing technique seems right. Learn the HHT and check your blades.

Let time and practice do the work. Good luck and don't give up.

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Unnecessary details follow:

I prep with olive oil soap Pre de Provence lavender (which I buy at Cuffs in Chagrin Falls, a great, great, high end store with salt of the earth people at its heart). I use Castle Forbes Lavender shave cream but can get a good shave with just about any soap or cream except Kiehl's "lite flite". Whether its Williams shave soap, an Arko shave stick, proraso, or another shave cream, I use very hot water. I always shave with a quarter ground straight, either a Hart or a Le Grelot. I hone once every two to three months using Lynn's synthetic water stone progression to 12k, then add 7 x strokes without pressure on a 16k shapton glass and on a 30k shapton glass. Before each shave I strop 11 strokes on the webbing then 77 strokes on a latigo 3" strop, taking care not to roll the blade into the strop.

Work ready shave is two passes on my face with extra attention to the chin and under the chin. BBS requires 3 passes plus extra chin work. I love straight razor shaving, and even with the outlay for pricey hones, have saved significantly compared to multiedged "modern" razors over the years. If I get called in to work in the middle of the night and time is limited, I shave DE with a Merkur barberpole using an Iridium Super blade or its equivalent, packaged for the market in Turkey. These are the only DE blades which will last me more than 3 three-pass shaves.

YMMV, but don't give up. Straight razor shaving is a skill which time and practice will make your own. Mastery of straight shaving is a gift of competence which a man gives to himself.