Chainsaw hay bale cutting

I have some bottom bales that have some mold on the bottom. The bales are otherwise good if I cut off 4-5". These are 3x4x8' bales for horses. I'm using a regular cross cut chain, 25" bar, and I switched out the bar oil for soybean oil that we use to lubricate our manure spreader chain. We ratchet strapped the bale with 2 truck straps. Then we cut the 4 strings and lifted the bale with the skid steer bale spear attachment. I checked the length of the spears to make sure I wouldn't hit them with my saw. I had 12 inches of free space(32" spears). I only had to cut off 4-5". No clogging of the saw clutch as I feared. I was cutting across the grain.