caad9車架尺寸的困擾

在01也潛水了一段很長的時間,最近想入主一台caad9公路車,也上網做Fitting,以下是我fitting的結果-------------------------------------------
Inseam: 80
Trunk: 66
Forearm: 35
Arm: 63.5
Thigh: 59.5
Lower Leg: 55
Sternal Notch: 145.5
Total Body Height: 178


The Competitive Fit (cm)
-------------------------------------------
Seat tube range c-c: 51.8 - 52.3
Seat tube range c-t: 53.4 - 53.9
Top tube length: 55.1 - 55.5
Stem Length: 11.2 - 11.8
BB-Saddle Position: 72.2 - 74.2
Saddle-Handlebar: 53.0 - 53.6
Saddle Setback: 3.6 - 4.0


The Eddy Fit (cm)
-------------------------------------------
Seat tube range c-c: 53.0 - 53.5
Seat tube range c-t: 54.6 - 55.1
Top tube length: 55.1 - 55.5
Stem Length: 10.1 - 10.7
BB-Saddle Position: 71.4 - 73.4
Saddle-Handlebar: 53.8 - 54.4
Saddle Setback: 4.8 - 5.2


The French Fit (cm)
-------------------------------------------
Seat tube range c-c: 54.7 - 55.2
Seat tube range c-t: 56.3 - 56.8
Top tube length: 56.3 - 56.7
Stem Length: 10.3 - 10.9
BB-Saddle Position: 69.7 - 71.7
Saddle-Handlebar: 55.5 - 56.1
Saddle Setback: 4.3 - 4.7

現在問題來了,cadd9 尺寸52的standover at top tube midpoint 是76.5公分 ,而適合我尺寸54的 standover at top tube midpoint 卻是78.5公分,我到底要選52或54的才不會造成卡蛋危機?
請各位先進幫幫我解決困擾多時的問題.3Q(沒有車可試跨)