DKR gel inconsistent?

I have been noticing this for a while - sometimes after finishing a bottle of Dan's Gel (and after cutting it in half to get the last little bit out) I open a new bottle and find that the gel is a lot thinner - feels more watery and takes much longer to put onto my skin and absorb. I tried shaking/squeezing/massaging the bottle to get it all mixed a bit more but that didn't seem to help.
Does anyone else notice this? Is it because some of the bottles are nearly a year old? (I buy in bulk because I am in NZ)

Thanks for any help
Aaron

PS I probably should add - the regime is awesome and I've been using it for a couple of years (though i had a break from it) - my advice: don't stop using the regime!

Does the CSR cause these huge lumps?

While the CSR works brilliantly on the main acne-prone part of my face (my beard-area), I have continuing problems with my neck, especially around the back. I get these HUGE cysts (I think that is what they are - really deep hard painful lumps that grow to 10-20mm for a couple of weeks to then turn soft and eventually burst after 2-3 days) but only on my neck, usually around the back or side.
I went off the regime for most of last year (I was fine all year but acne came back when I travelled recently) and noticed that when I went back on I started getting these huge lumps around the back of my neck again. I thought it might be caused by applying too much BP when I first go on (I read that somewhere), but I remember a couple of years ago that these things do not stop once my skin is used to the regime.
I didn't get any of these lumps last year so is it possible that the BP gel is causing them? I have now been back on the regime for one and a half months and am still getting these things.