You can use 'cjne a,#27,$+3', for example, which will take you to the next instruction whether you jump or don't. Then you test the cy bit.
Else, set yourself up with some macros, like below:

;CJGE		Compare and jump if X1 equal or greater then X2
CJGE	macro X1,X2,X3
	LOCAL X0
	cjne X1,X2,X0
X0	jnc X3
	MEND

;CJG		Compare and jump if X1 greater then X2
CJG	macro X1,X2,X3
	LOCAL j0,j1
	CJE X1,X2,j1
	jnc X3
j1	MEND

;CJL		Compare and jump if X1 less than X2
CJL	macro X1,X2,X3
	LOCAL X0
	cjne X1,X2,X0
X0:	jc X3
	MEND

;CJLE		Compare and jump if X1 less than or equal X2
CJLE	macro X1,X2,X3
	LOCAL X0
	cjne X1,X2,X0
	sjmp X3
X0:	jc X3
	MEND

Try to avoid using CJLE and CJG - they are less efficient...
Dave