Latimoos wrote:... I actually find the bike harder to ride with no noticeable improvements in my pace. I get WAY more tired, feel a lot more in the way of burning legs and just a general lack of power - its very odd....
gregoryoftours wrote:...maybe position and bike fit is an issue...
"WAY more tired, feel a lot more in the way of burning legs and just a general lack of power" in comparison to the Boardman would also have me questioning the differences in bike fit. Your Boardman may well not be correct either but the fact that it feels better then if possible I'd at least try and replicate the saddle height and set back.
You'd be amazed how much difference getting those two measurements correct makes.
As a bike fitter in many ways we are not looking at the saddle height, we are looking at a leg angle and position over the Bottom Bracket, it's when both those are correct that we measure the 'saddle height' and 'set back'. The
Boardman has a 73 degree seat tube and depending on the year the
Allez Comp will be similar, as rule of thumb we struggle to get the rider far enough behind the Bottom Bracket, it's why the seat posts on bikes with these seat angles have a layback pin and invariably saddles are pushed back as far on the rails as possible.
The third picture in the sequence immediately above references Knee over pedal spindle (KOPS), often referred to as 'the myth of KOPS', which I am quickly referencing before anyone else jumps on that; welcome to bike forums

Maybe more than you want to know at this stage but there is much more about
Kops elsewhere in the forum should you be hungry for more.
The reason I have referenced it here is that it is an easy thing to show on those drawings and then relate and cross reference to your bikes. 'Kops' alludes to more than one thing, some of it is about effort range, in layman's terms a runner at high effort, a 100m sprinter for example will generally run on their toes, where as an endurance runner will use the whole foot. A bike rider will also intuitively morph into a different position as their effort increases, the higher the effort the more they will pull themselves forward over the BB, then slide back again as that effort reduces, although they will hold that high effort position for longer than a runner will remain 'on their toes'; a TT bike will have often have a steeper seat tube and non layback seatpin to facilitate this.
Just as significant with saddle seatback/KOPS is how the rider engages their core, often referred to by bike fitters as 'BMR', to far forward and the rider does not engage their core in the same way, they may no longer just reaching for the bars, but propping themselves up by the bars. The result is normally less comfort, often translating to lower back discomfort, shoulders, neck arms, wrists and hands. If correct not only will you find it more comfortable but you are in effect more in harmony with your bike, syncing with it as opposed to fighting with it.
Colin531 has an excellent
DIY bike fitting information sheet that elaborates far more on what I have done; well worth a read.