Can you give us some specifics on what you are dealing with, in this one, or various situations. Is it smooth bark or rough? What size pieces, rigged or not? Are they single bar width, or are you cutting your facecut and backcut from both sides?
Couple of thoughts, using the Undermine the COG sniped snap-cut (aka the Magic Cut-I like that name) means not having to get a perfect match on your two face cuts, as you are intentionally making a horizontal dutchman. This works out well if you don't need exact directional control, but you want it to rock off in one direction toward a LZ.
If you are rigging it, you don't need much directional control for blocks the way you do for a tight landing zone.
You can snap cut smaller pieces (not logs)with the holding wood running in line to the lean, then push. This means staying on the top side the whole time.
A SRT choked climbline is useful. It chokes only one direction, so you have to figure that out in advance, since you will be using it to block down removals, you will not need to reascent, so the F8 Revolver (or non-Revolver) system will be perfect if you don't have a GriGri (oh GG2 when do you come out?), Uni, I'D, etc.
You can also choke your rope lanyard in the direction opposite to the choked climbline with an SRT set-up for both.
You can keep your climbline choked at the top of the spar,with a running bowline with long tail for pulling it down after cutting the facecut, before cutting your back cut. Same with a choking ring and ring type of friction saver. ALWAYS CHECK THAT YOU HAVE PULLED YOUR CLIMBLINE DOWN FROM THE TOP OF THE SPAR BEFORE YOUR SAPWOOD KERF CUTS AND BACKCUT!!!!! Seems impossible to forget, but fatique, dehydration, hunger, rain, urgent need to use the bathroom can derail the train of thought. I guess people get used to tuning out the ropes in front of their faces. Disabling accidents/ deaths occur this way. Usually to people earlier in their climbing careers.
Those ninja hand climbing spikes are not talked about much, but are a secret weapon, just hard to run the saw. I keep mine on a lanyard attached to each wrist, so that I can shake them off and let them dangle when I need to cut. You wouldn't believe how these and the ninja flash/ smoke pellets amaze the customer.