Doesn’t sound like you have enough wood... you have to get it hot enough to draft. Half of one log is just going to smolder and won’t create enough heat to draft.
20d fabric seems kinda light... any durability / puncture problems with this pad or is it good to boot? I have it narrowed down to this one or the 9 Xp which is a fair amount heavier. Would prefer not to carry the extra weight if I don’t have to but it’s better than deflated pads.