Lower Back Ache

Any advice on this one, please?
I went out on my winter bike yesterday for the first time in about 8 months as it's only just been rebuilt. About 25 miles into the group ride my lower back started aching which doesn't usually happen until much later, if at all. I do have a lower back problem which does mean it flares up from time to time, especially on longer (60+ miles) rides. Stretching before and after (and sometimes during) a ride helps.
I've compared the geometry against the summer bike and found that the seat height is the same, so is the distance from the seat to the bars. The only thing that isn't the same is the seat position relative to the bottom bracket. On the winter bike the seat is set a few centimetres further forward than it is on the summer bike.
If I move the seat back I will be increasing the distance to the bars which makes me think that would only magnify the lower back problem.
Should I try it and see what happens, or are there any other suggestions?
I went out on my winter bike yesterday for the first time in about 8 months as it's only just been rebuilt. About 25 miles into the group ride my lower back started aching which doesn't usually happen until much later, if at all. I do have a lower back problem which does mean it flares up from time to time, especially on longer (60+ miles) rides. Stretching before and after (and sometimes during) a ride helps.
I've compared the geometry against the summer bike and found that the seat height is the same, so is the distance from the seat to the bars. The only thing that isn't the same is the seat position relative to the bottom bracket. On the winter bike the seat is set a few centimetres further forward than it is on the summer bike.
If I move the seat back I will be increasing the distance to the bars which makes me think that would only magnify the lower back problem.
Should I try it and see what happens, or are there any other suggestions?
Summer: Kuota Kebel
Winter: GT Series3
Winter: GT Series3
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People will say "change your position - are you too stretched - are your handlebars too low etc)", but stick it out for now.
Give it a month, if it still hurts, try one of the above.
Probably the wrong ones! I concentrate on stretching my hamstrings and glutes as that's where I'm told my back problem originates.
Winter: GT Series3
Specialized Roubaix SL3 Expert 2012, Cannondale CAAD5,
Marin Mount Vision (1997), Edinburgh Country tourer, 3 cats!
I was going suggest the stretches you're doing already. I was getting tightness in the knees and after some good advice on here i started stretching my quads, glutes and hamstrings. Sorted my knee problem and has worked wonders with my problematic lower back, which used to ache daily.
Hope you get to the root of your discomfort.